Washington, D.C. 20549

                                  SCHEDULE 13G

                                  (AMENDMENT 5)*

                                 MESA AIR GROUP
                                (Name of Issuer)

                                 COMMON STOCK
                         (Title of Class of Securities)

                                 (CUSIP Number)

             (Date of Event Which Requires Filing of this Statement)

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

         [X]     Rule 13d-1(b)
         [ ]     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 the
disclosures provided in a prior cover page.

The information required in 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

CUSIP No. 590479101

     1.   Names of Reporting Persons.
          I.R.S. Identification Nos. of above persons (entities only).

          Dimensional Fund Advisors LP (Tax ID: 30-0447847)

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

          (b)  X

     3.   SEC Use Only

     4.   Citizenship or Place of Organization

          Delaware Limited Partnership

                   5.    Sole Voting Power
Number of Shares         1665780 **see Note 1**
Owned by           6.    Shared Voting Power
Each Reporting           0
Person With
                   7.    Sole Dispositive Power
                         1678569 **see Note 1**

                   8.    Shared Dispositive Power

     9.   Aggregate Amount Beneficially Owned by Each Reporting Person

          1678569 **see Note 1**

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


     11.  Percent of Class Represented by Amount in Row (9)


     12.  Type of Reporting Person (See Instructions)


Item 1.

         (a)      Name of Issuer

                  Mesa Air Group Inc.

         (b)      Address of Issuer's Principal Executive Offices

                  410 N 44th St, Suite 700, Phoenix, AZ 85008-7690

Item 2.

         (a)      Name of Person Filing

                  Dimensional Fund Advisors LP

         (b)      Address of Principal Business Office, or if none, Residence

                  Palisades West, Building One
                  6300 Bee Cave Road
                  Austin, TX 78746

         (c)      Citizenship

                  Delaware Limited Partnership

         (d)      Title of Class of Securities

                  Common Stock

         (e)      CUSIP Number


Item 3.  If  this  statement  is  filed  pursuant   to Sec. 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)  [X]  An  investment  adviser  in  accordance  with Sec. 240.13d-1(b)

     (f)  [ ]  An  employee  benefit  plan or endowment fund in accordance  with
               Sec. 240.13d-1(b)(1)(ii)(F);

     (g)  [ ]  A parent holding  company  or  control person in accordance  with
               Sec. 240.13d-1(b)(1)(ii)(G);

     (h)  [ ]  A savings associations  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 Sec. 240.13d-1(b)(1)(ii)(J).

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.

     (a)  Amount beneficially owned:      1678569 **see Note 1**

     (b)  Percent of class:               1.55%%

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

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

                1665780 **see Note 1**

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


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

                1678569 **see Note 1**

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


**Note 1** Dimensional Fund Advisors LP("Dimensional"), an investment advisor
registered under Section 203 of the Investment Advisors Act of 1940, furnishes
investment advice to four investment companies registered under the Investment
Company Act of 1940, and serves as investment manager to certain other
commingled group trusts and separate accounts. These investment companies,
trusts and accounts are the "Funds." In its role as investment advisor or
manager, Dimensional possesses voting and/or investment power over the
securities of the Issuer described in this schedule that are owned by the Funds,
and may be deemed to be the beneficial owner of the shares of the Issuer held by
the Funds. However, all securities reported in this schedule are owned by the
Funds. Dimensional disclaims beneficial ownership of such securities.
In addition, the filing of this Schedule 13G shall not be construed as an
admission that the reporting person or any of its affiliates is the beneficial
owner of any securities covered by this Schedule 13G for any other purposes than
Section 13(d) of the Securities Exchange Act of 1934.

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

The Funds  described in Note 1 above  have the right to receive or the power to
direct the receipt of  dividends  from,  or the  proceeds  from the sale of, the
securities held in their  respective  accounts.  To the knowledge of Dimensional
Fund Advisors  LP, the interest of any  one such Fund does not exceed 5%  of the
class  of  securities.  Dimensional  Fund  Advisors LP  disclaims  beneficial
ownership of all such securities.

Item 7.  Identification  and Classification of the Subsidiary Which Acquired the
         Security  Being  Reported  on By  the Parent Holding Company or Control


Item 8.  Identification and Classification of Members of the Group


Item 9.  Notice of Dissolution of Group


Item 10. Certification

     By signing  below I certify  that,  to the best of my knowledge and belief,
     the securities referred to above were acquired and are held in the ordinary
     course of business  and 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.


After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                                      March 4, 2009

                                      /s/ Christopher Crossan

                                      Chief Compliance Officer