FRONTIER AIRLINES INC /CO/
SC 13G/A, 1999-01-28
AIR TRANSPORTATION, SCHEDULED
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


                             FRONTIER AIRLINES, INC.
                                (Name of Issuer)

                  Common Stock Purchase Warrants, no par value
                         (Title of Class of Securities)

                                     [FRNT]
                                 (CUSIP Number)


                                December 31, 1998
             (Date of Event Which Requires Filing of this Statement)






Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [   ]     Rule 13d-1(b)
         [ X ]     Rule 13d-1(c)
         [   ]     Rule 13d-1(d)






*        The  remainder  of this cover page shall be filled out for a  reporting
         person's  initial filing on this form with respect to the subject class
         of securities,  and for any subsequent amendment containing information
         which would alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
         be deemed to be "filed" for the purpose of Section 18 of the Securities
         Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
         that section of the Act but shall be subject to all other provisions of
         the Act (however, see the Notes).

                                                              Page 1 of 11 Pages

<PAGE>
CUSIP No. [FRNT]


1.       Names of Reporting Persons.       

         IMPRIMIS INVESTORS LLC

         I.R.S. Identification Nos. of Above Persons (entities only)



2.       Check the Appropriate Box if a Member of a Group                (a) [ ]
         (See Instructions)                                              (b) [ ]


3.       SEC Use Only


4.       Citizenship or Place of Organization                           Delaware



         Number of Shares      5.      Sole Voting Power                       0
         Beneficially
         Owned by Each         6.      Shared Voting Power               380,120
         Reporting
         Person With           7.      Sole Dispositive Power                  0

                               8.      Shared Dispositive Power          380,120

9.       Aggregate Amount Beneficially Owned by Each Reporting Person    380,120


10.      Check if the Aggregate Amount in Row (9) Excludes
         Certain Shares (See Instructions)                                   [ ]


11.      Percent of Class Represented by Amount in Row 9                    2.4%


12.      Type of Reporting Person (See Instructions)                          CO



                                                              Page 2 of 11 Pages
<PAGE>
CUSIP No. [FRNT]


1.       Names of Reporting Persons.  
         
         WEXFORD SPECTRUM INVESTORS LLC

         I.R.S. Identification Nos. of Above Persons (entities only)



2.       Check the Appropriate Box if a Member of a Group                (a) [ ]
         (See Instructions)                                              (b) [ ]


3.       SEC Use Only


4.       Citizenship or Place of Organization                           Delaware



         Number of Shares      5.      Sole Voting Power                       0
         Beneficially
         Owned by Each         6.      Shared Voting Power                     0
         Reporting
         Person With           7.      Sole Dispositive Power                  0

                               8.      Shared Dispositive Power                0

9.       Aggregate Amount Beneficially Owned by Each Reporting Person          0


10.      Check if the Aggregate Amount in Row (9) Excludes
         Certain Shares (See Instructions)                                   [ ]


11.      Percent of Class Represented by Amount in Row 9                      0%


12.      Type of Reporting Person (See Instructions)                          CO



                                                              Page 3 of 11 Pages
<PAGE>
CUSIP No. [FRNT]


1.       Names of Reporting Persons. 

         CHARLES E. DAVIDSON

         I.R.S. Identification Nos. of Above Persons (entities only)



2.       Check the Appropriate Box if a Member of a Group                (a) [ ]
         (See Instructions)                                              (b) [ ]


3.       SEC Use Only


4.       Citizenship or Place of Organization                      United States



         Number of Shares      5.      Sole Voting Power                       0
         Beneficially
         Owned by Each         6.      Shared Voting Power               380,120
         Reporting
         Person With           7.      Sole Dispositive Power                  0

                               8.      Shared Dispositive Power          380,120

9.       Aggregate Amount Beneficially Owned by Each Reporting Person    380,120


10.      Check if the Aggregate Amount in Row (9) Excludes
         Certain Shares (See Instructions)                                   [ ]


11.      Percent of Class Represented by Amount in Row 9                    2.4%


12.      Type of Reporting Person (See Instructions)                          IN



                                                              Page 4 of 11 Pages
<PAGE>
CUSIP No. [FRNT]


1.       Names of Reporting Persons.    

         JOSEPH M. JACOBS

         I.R.S. Identification Nos. of Above Persons (entities only)



2.       Check the Appropriate Box if a Member of a Group                (a) [ ]
         (See Instructions)                                              (b) [ ]


3.       SEC Use Only


4.       Citizenship or Place of Organization                      United States



         Number of Shares      5.      Sole Voting Power                       0
         Beneficially
         Owned by Each         6.      Shared Voting Power               380,120
         Reporting
         Person With           7.      Sole Dispositive Power                  0

                               8.      Shared Dispositive Power          380,120

9.       Aggregate Amount Beneficially Owned by Each Reporting Person    380,120


10.      Check if the Aggregate Amount in Row (9) Excludes
         Certain Shares (See Instructions)                                   [ ]


11.      Percent of Class Represented by Amount in Row 9                    2.4%


12.      Type of Reporting Person (See Instructions)                          IN



                                                              Page 5 of 11 Pages
<PAGE>
CUSIP No. [FRNT]


1.       Names of Reporting Persons.   

         WEXFORD MANAGEMENT LLC

         I.R.S. Identification Nos. of Above Persons (entities only)



2.       Check the Appropriate Box if a Member of a Group                (a) [ ]
         (See Instructions)                                              (b) [ ]


3.       SEC Use Only


4.       Citizenship or Place of Organization                        Connecticut



         Number of Shares      5.      Sole Voting Power                       0
         Beneficially
         Owned by Each         6.      Shared Voting Power               380,120
         Reporting
         Person With           7.      Sole Dispositive Power                  0

                               8.      Shared Dispositive Power          380,120

9.       Aggregate Amount Beneficially Owned by Each Reporting Person    380,120


10.      Check if the Aggregate Amount in Row (9) Excludes
         Certain Shares (See Instructions)                                   [ ]


11.      Percent of Class Represented by Amount in Row 9                    2.4%


12.      Type of Reporting Person (See Instructions)                          CO



                                                              Page 6 of 11 Pages
<PAGE>
Item 1.

     (a)   The name of the issuer is FRONTIER AIRLINES, INC. (the "Issuer").

     (b)   The principal executive office of the Issuer is located at 12015 East
           46th Avenue, Denver, Colorado 80239.

Item 2.

     (a)   This  statement  is being  filed by (i)  Imprimis  Investors  LLC,  a
           Delaware  limited  liability  company   ("Imprimis"),   (ii)  Wexford
           Spectrum   Investors  LLC,  a  Delaware  limited   liability  company
           ("Wexford  Spectrum",  and collectively  with Imprimis,  the "Warrant
           Holders")  (iii)  Wexford  Management  LLC,  a  Connecticut   limited
           liability  company ("Wexford  Management"),  (iv) Charles E. Davidson
           and (v) Joseph M. Jacobs (the  individuals  and entities  referred to
           above, collectively, the "Reporting Persons").

     (b)   The principal  business and office address for the Reporting  Persons
           is c/o Wexford  Management  LLC, 411 West Putnam  Avenue,  Suite 125,
           Greenwich, Connecticut 06930.

     (c)   Imprimis  is a Delaware  limited  liability  company,  the members of
           which are private  investment  funds.  Imprimis was organized for the
           purpose of making various investments.

           Wexford Spectrum is a Delaware limited liability company, the members
           of which are private  investment  funds.  Wexford Spectrum was formed
           for the purpose of making various investments.

           Wexford  Management,  a Connecticut  limited liability company,  is a
           registered Investment Advisor and the manager of the Warrant Holders.
           Wexford   Management   also  serves  as  an  investment   advisor  or
           sub-advisor to the members of the Warrant Holders.

           Charles E. Davidson, a United States citizen, is chairman, a managing
           member and a controlling member of Wexford  Management.  Mr. Davidson
           is a  controlling  person  or an  investor  in a  number  of  private
           companies, including certain members of the Warrant Holders.

           Joseph M. Jacobs, a United States citizen,  is president,  a managing
           member and a controlling member of Wexford Management.  Mr. Jacobs is
           a controlling person or an investor in a number of private companies,
           including certain members of the Warrant Holders.

     (d)   This class of securities to which this statement relates is a warrant
           (the "Warrant") to purchase shares of the common stock, no par value,
           of the  Issuer  (the  "Common  Stock").  This  statement  amends  the
           Schedule 13G, dated October 9, 1998, filed by the Reporting Person in
           respect of the Warrants.

     (e) The CUSIP number of the Warrant is [FRNT].

                                                              Page 7 of 11 Pages
<PAGE>
Item 3.

If this statement is filed pursuant to rule 240.13d-  1(b), or  240.13d-2(b)  or
(c), check whether the person filing is a:

     (a)   ___  Broker  or dealer  registered  under  section  15 of the Act (15
           U.S.C. 78o).

     (b)   ___ Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

     (c)   ___ Insurance  company as defined in section  3(a)(19) of the Act (15
           U.S.C. 78c).

     (d)   ___ Investment  company  registered under section 8 of the Investment
           Company Act of 1940 (15 U.S.C. 80a-8).

     (e)   ___ An investment adviser in accordance with 240.13d- 1(b)(1)(ii)(E).

     (f)   ___ An employee benefit plan or endowment fund in accordance with

     (g)   ___ A parent  holding  company or control  person in accordance  with
           240.13d-1(b)(1)(ii)(G)

     (h)   ___ A savings  association  as defined in section 3(b) of the Federal
           Deposit Insurance Act (12 U.S.C. 1813).

     (i)   ___ A  church  plan  that  is  excluded  from  the  definition  of an
           investment  company under section 3(c)(14) of the Investment  Company
           Act of 1940 (15 U.S.C. 80a-3).

     (j)   ___ Group, in accordance with section 240.13d-1(b)(1)(ii)(J).

     If this statement is filed pursuant to 240.13d-1(c), check this box. [ X ].

Item 4.    Ownership.

     Provide  the  following  information  regarding  the  aggregate  number and
percentage of the class of securities of the issuer identified in Item 1.

     The  Reporting  Persons may be deemed to own  beneficially  the  respective
percentages  and numbers of Warrants set forth below (on the basis of 15,161,944
shares of Common Stock issued and outstanding).

     Imprimis Investors LLC
     (a)   Amount beneficially owned:                                    380,120

     (b)   Percent of class:                                                2.4%

     (c)   Number of shares as to which the person has:

           (i)    Sole power to vote or to direct the vote:                    0

           (ii)   Shared power to vote or to direct the vote:            380,120

           (iii)  Sole power to dispose or to direct the disposition of:       0

           (iv)   Shared  power to  dispose  or to direct  the  disposition  of:
                                                                         380,120

                                                              Page 8 of 11 Pages
<PAGE>
     Wexford Spectrum Investors LLC
     (a)   Amount beneficially owned:                                          0

     (b)   Percent of class: 0%

     (c)   Number of shares as to which the person has:

           (i)    Sole power to vote or to direct the vote:                    0

           (ii)   Shared power to vote or to direct the vote:                  0

           (iii)  Sole power to dispose or to direct the disposition of:       0

           (iv)   Shared power to dispose or to direct the disposition of:     0

     Charles E. Davidson
     (a)   Amount beneficially owned:                                    380,120

     (b)   Percent of class:                                                2.4%

     (c)   Number of shares as to which the person has:


           (i)    Sole power to vote or to direct the vote:                    0

           (ii)   Shared power to vote or to direct the vote:            380,120

           (iii)  Sole power to dispose or to direct the disposition of:       0

           (iv)   Shared power to dispose or to direct the disposition of: 
                                                                         380,120

     Joseph M. Jacobs
     (a)   Amount beneficially owned:                                    380,120

     (b)   Percent of class:                                                2.4%

     (c)   Number of shares as to which the person has:

           (i)    Sole power to vote or to direct the vote:                    0

           (ii)   Shared power to vote or to direct the vote:            380,120

           (iii)  Sole power to dispose or to direct the disposition of:       0

           (iv)   Shared power to dispose or to direct the disposition of:
                                                                         380,120

     Wexford Management LLC
     (a)   Amount beneficially owned:                                    380,120

     (b)   Percent of class:                                                2.4%

     (c)   Number of shares as to which the person has:

           (i)    Sole power to vote or to direct the vote:                    0

           (ii)   Shared power to vote or to direct the vote:            380,120

                                                              Page 9 of 11 Pages
<PAGE>
           (iii)  Sole power to dispose or to direct the disposition of:       0

           (iv)   Shared power to dispose or to direct the disposition of:
                                                                         380,120

     Wexford  Management may, by reason of its status as manager of Imprimis and
Wexford Spectrum,  be deemed to own beneficially the interests in the Warrant of
which Imprimis and Wexford Spectrum possess beneficial ownership.

     Each of Charles E.  Davidson  and Joseph M.  Jacobs  may,  by reason of his
status  as a  controlling  person  of  Wexford  Management,  be  deemed  to  own
beneficially the interests in the Warrant of which Imprimis and Wexford Spectrum
possess beneficial ownership.

     Each of Charles E. Davidson, Joseph M. Jacobs and Wexford Management shares
the power to vote and to dispose of the  interests  in the Warrant  Imprimis and
Wexford Spectrum beneficially own.

Item 5.    Ownership of Five Percent or Less of a Class

If this  statement  is being filed to report the fact that as of the date hereof
the  reporting  person has ceased to be the  beneficial  owner of more than five
percent of the class of securities, check the following [ X [.

Item 6.    Ownership of More than Five Percent on Behalf of Another Person

     Not applicable.

Item 7.    Identification and Classification of the Subsidiary which Acquired
           the Security Being Reported on by the Parent holding Company

     Not applicable.

Item 8.    Identification and Classification of Members of the group

     Not applicable.

Item 9.    Notice of Dissolution of Group

     Not applicable.

Item 10.   Certification.

By signing below I certify  that,  to the best of my knowledge  and belief,  the
securities  referred to above were not acquired and are not held for the purpose
of or with the effect of  changing or  influencing  the control of the issuer of
the securities and were not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.

                                                             Page 10 of 11 Pages

<PAGE>

Dated:     January 28, 1999

                                            IMPRIMIS INVESTORS LLC

                                            By:   /S/ ARTHUR A. AMRON
                                                  -------------------
                                                  Name: Arthur H. Amron
                                                  Title:   Vice President


                                            WEXFORD SPECTRUM INVESTORS LLC

                                            By:   /S/ ARTHUR A. AMRON
                                                  -------------------
                                                  Name: Arthur H. Amron
                                                  Title:   Vice President


                                            WEXFORD MANAGEMENT LLC

                                            By:   /S/ ARTHUR A. AMRON
                                                  -------------------
                                                  Name: Arthur H. Amron
                                                  Title:   Senior Vice President


                                                  /S/ CHARLES E. DAVIDSON
                                                  -----------------------
                                                  CHARLES E. DAVIDSON


                                                  /S/ JOSEPH M. JACOBS
                                                  --------------------
                                                  JOSEPH M. JACOBS

                                                             Page 11 of 11 Pages



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