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  SEC FILE NUMBER  
 
0-15495
 
     
  CUSIP NUMBER  
 
 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 12b-25
NOTIFICATION OF LATE FILING
           
(Check one):   o  Form 10-K o  Form 20-F þ  Form 11-K o  Form 10-Q o  Form 10-D o  Form N-SAR o  Form N-CSR
 
         
 
  For Period Ended:   September 30, 2005
 
     
 
         
    o   Transition Report on Form 10-K  
 
         
    o   Transition Report on Form 20-F  
 
         
    o   Transition Report on Form 11-K  
 
         
    o   Transition Report on Form 10-Q  
 
         
    o   Transition Report on Form N-SAR  
 
         
 
  For the Transition Period Ended:    
 
       

Read Instruction (on back page) Before Preparing Form. Please Print or Type.
Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.
If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates:
PART I — REGISTRANT INFORMATION
Mesa Air Group, Inc.
 
Full Name of Registrant
Mesa Airlines, Inc (filings through 1995-02-15)
 
Former Name if Applicable
410 North 44th Street, Suite 700
 
Address of Principal Executive Office (Street and Number)
Phoenix, Arizona 85008
 
City, State and Zip Code
PART II — RULES 12b-25(b) AND (c)
If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)
           
þ
    (a)   The reason described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense
       
    (b)   The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q or subject distribution report on Form 10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and
       
      (c)   The accountant’s statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.
PART III — NARRATIVE
State below in reasonable detail why Forms 10-K, 20-F, 11-K, 10-Q,10-D, N-SAR, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period.
The delay in filing of Mesa Air Group, Inc.’s Form 11-K for the fiscal year ended September 30, 2005, is primarily attributable to its inability to timely gather the required information.
SEC 1344 (03-05)   Persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

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(Attach extra Sheets if Needed)
PART IV — OTHER INFORMATION
(1)   Name and telephone number of person to contact in regard to this notification
         
Brian Gillman    (602)    685-4000 
(Name)
  (Area Code)   (Telephone Number)
(2)   Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed ? If answer is no, identify report(s).
    Yes þ     No o
 
   
 
(3)   Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof?
    Yes o     No þ
 
   
 
 
    If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.
 
Mesa Air Group, Inc.  
(Name of Registrant as Specified in Charter)
has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.
             
Date
  March 29, 2006   By   /s/ Brian S. Gillman
 
           
 
          Name:  Brian S. Gillman
 
          Title:  Vice President, General Counsel and Secretary