FRONTIER AIRLINES INC /CO/
SC 13D/A, 1998-04-03
AIR TRANSPORTATION, SCHEDULED
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                 SCHEDULE 13D/A
 

                    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)



                              Arthur H. Amron, Esq.
                             411 West Putnam Avenue
                               Greenwich CT 06830
                                 (203) 862-7028
- --------------------------------------------------------------------------------
(Name,  Address and Telephone Number of Person Authorized to Receive Notices and
Communications)

                                     2/27/98
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box O

Check the following box if a fee is being paid with this  statement O. (A fee is
not required  only if the filing  person:  (1) has a previous  statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)
<PAGE>
                                  SCHEDULE 13D
- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  2  of  9 Pages
- --------------------------------------------------------------------------------
  
   1     NAME OF REPORTING PERSON

         Imprimis Investors LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         (Intentionally Omitted)

   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a) [X]
                                                                       (b)

   3     SEC USE ONLY
  
   4     SOURCE OF FUNDS
 
            WC

   5     CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS 2(d) or 2(e)

   6     CITIZENSHIP OR PLACE OF ORGANIZATION
  
         Delaware
                           7        SOLE VOTING POWER
                            
                                          None

                           8        SHARED VOTING POWER
                            
                                         875,000

                           9        SOLE DISPOSITIVE POWER
                          
                                          None  

                          10        SHARED DISPOSITIVE POWER
                          
                                         875,000

   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    875,000 

   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    7.96%

   14    TYPE OF REPORTING PERSON

                    00
<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  3  of  9 Pages
- --------------------------------------------------------------------------------

  1      NAME OF REPORTING PERSON

         Wexford Spectrum Investors LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         (Intentionally Omitted)

  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a) [X}
                                                                       (b)

  3      SEC USE ONLY


  4      SOURCE OF FUNDS

            WC

  5      CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS  2(d) or 2(e)
       
  6      CITIZENSHIP OR PLACE OF ORGANIZATION
  
            Delaware
                           7         SOLE VOTING POWER
                            
                                          None

                           8        SHARED VOTING POWER
                           
                                          875,000

                           9        SOLE DISPOSITIVE POWER
                            
                                          None

                           10         SHARED DISPOSITIVE POWER
                           
                                          875,000

   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    875,000

   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    7.96%

   14    TYPE OF REPORTING PERSON             
                    00
<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  4  of  9 Pages
- --------------------------------------------------------------------------------

  1      NAME OF REPORTING PERSON

         Wexford Management LLC

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         (Intentionally Omitted)

  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a) [X}
                                                                       (b)

  3      SEC USE ONLY


  4      SOURCE OF FUNDS

            AF

  5      CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS  2(d) or 2(e)
       
  6      CITIZENSHIP OR PLACE OF ORGANIZATION
  
            Connecticut
                           7         SOLE VOTING POWER
                            
                                          None

                           8        SHARED VOTING POWER
                           
                                          1,750,000

                           9        SOLE DISPOSITIVE POWER
                            
                                          None

                           10         SHARED DISPOSITIVE POWER
                           
                                          1,750,000

   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,750,000

   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    15.93%

   14    TYPE OF REPORTING PERSON    
         
                    IA
<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  5  of  9 Pages
- --------------------------------------------------------------------------------

  1      NAME OF REPORTING PERSON

         Charles E. Davidson

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         (Intentionally Omitted)

  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a) [X}
                                                                       (b)

  3      SEC USE ONLY


  4      SOURCE OF FUNDS

            AF

  5      CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS  2(d) or 2(e)
       
  6      CITIZENSHIP OR PLACE OF ORGANIZATION
  
            United States of America
                           7         SOLE VOTING POWER
                            
                                          None

                           8        SHARED VOTING POWER
                           
                                          1,750,000

                           9        SOLE DISPOSITIVE POWER
                            
                                          None

                           10         SHARED DISPOSITIVE POWER
                           
                                          1,750,000

   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,750,000

   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    15.93%

   14    TYPE OF REPORTING PERSON      
       
                    IN
<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  6  of  9 Pages
- --------------------------------------------------------------------------------

  1      NAME OF REPORTING PERSON

         Joseph M. Jacobs

         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         (Intentionally Omitted)

  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a) [X}
                                                                       (b)

  3      SEC USE ONLY


  4      SOURCE OF FUNDS

            AF

  5      CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS  IS REQUIRED  PURSUANT TO
         ITEMS  2(d) or 2(e)
       
  6      CITIZENSHIP OR PLACE OF ORGANIZATION
  
            United States of America
                           7         SOLE VOTING POWER
                            
                                          None

                           8        SHARED VOTING POWER
                           
                                          1,750,000

                           9        SOLE DISPOSITIVE POWER
                            
                                          None

                           10         SHARED DISPOSITIVE POWER
                           
                                          1,750,000

   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,750,000

   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    15.93%

   14    TYPE OF REPORTING PERSON      
       
                    IN
<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  7  of  9 Pages
- --------------------------------------------------------------------------------
          The Schedule 13D as originally filed is amended as follows:

Item 3.   Source and Amount of Funds or Other Consideration.

         On February 27, 1998,  the Letter  Agreement was  terminated  and a new
letter agreement entered into (the "New Letter Agreement").  Pursuant to the New
Letter  Agreement,  (i) the total  number of shares  issuable  under the Warrant
Agreement was reduced to 1,750,000,  and references to the Commitment Letter are
no longer operative;  (ii) Wexford Management agreed that for a period of a year
neither  it nor its  affiliated  funds  would  purchase  or obtain  the right to
acquire  any Shares  other than on exercise  of the  warrants  under the Warrant
Agreement;  and (iii)  Wexford  waived any  defaults  under the Note and related
documentation,  and  Wexford  and the  Company  released  each other and certain
related  parties  from any  liability  associated  with any  agreement in effect
between the parties.


Item 4.  Purpose of Transaction.

         See Item 3 above.


Item 5.   Interest in Securities of the Issuer.

         See cover page.


Item 6.   Contracts, Arrangements, Understandings or  Relationships with Respect
          to Securities of the Issuer.

          See Item 3 above. 



<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  8  of  9 Pages
- --------------------------------------------------------------------------------





                                    SIGNATURE

         After reasonable  inquiry and to the best of each of the  undersigned's
knowledge and belief, each of the undersigned certifies that the information set
forth in this statement is true, complete and correct.


Dated:  April 3, 1998

                               IMPRIMIS INVESTORS LLC

                         By:  /s/  Arthur H. Amron
                              --------------------
                       Name:  Arthur H. Amron
                      Title:  Vice President


                              WEXFORD SPECTRUM INVESTORS LLC

                         By:  /s/ Arthur H. Amron
                              -------------------
                       Name:  Arthur H. Amron
                      Title:  Vice President


                              WEXFORD MANAGEMENT LLC


                        By:   /s/ Arthur  H. Amron
                              --------------------
                       Name:  Arthur H. Amron
                       Title: Senior Vice President



                              /s/ Charles E. Davidson
                              -----------------------
                              Charles E. Davidson


                              /s/ Joseph M. Jacobs
                              --------------------
                              Joseph M. Jacobs






<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
 CUSIP No. CUSIP No. FRNT                                   Page  9  of  9 Pages
- --------------------------------------------------------------------------------



                                    EXHIBIT I

    Pursuant to Rule  13d-1(f)(1)(iii)  of Regulation 13D-G of the General Rules
and Regulations of the Securities and Exchange  Commission  under the Securities
Exchange Act of 1934, as amended,  the  undersigned  agree that the statement to
which  this  Exhibit  is  attached  is  filed on  behalf  of each of them in the
capacities set forth below.



                               IMPRIMIS INVESTORS LLC

                         By:  /s/  Arthur H. Amron
                              --------------------
                       Name:  Arthur H. Amron
                      Title:  Vice President


                              WEXFORD SPECTRUM INVESTORS LLC

                         By:  /s/ Arthur H. Amron
                              -------------------
                       Name:  Arthur H. Amron
                      Title:  Vice President


                              WEXFORD MANAGEMENT LLC


                        By:   /s/ Arthur  H. Amron
                              --------------------
                       Name:  Arthur H. Amron
                       Title: Senior Vice President



                              /s/ Charles E. Davidson
                              -----------------------
                              Charles E. Davidson


                              /s/ Joseph M. Jacobs
                              --------------------
                              Joseph M. Jacobs


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