    <SEC-DOCUMENT>0001193125-18-238900-index.html : 20180806
    <SEC-HEADER>0001193125-18-238900.hdr.sgml : 20180806
    <ACCEPTANCE-DATETIME>20180806061122
    ACCESSION NUMBER:		0001193125-18-238900
    CONFORMED SUBMISSION TYPE:	S-1/A
    PUBLIC DOCUMENT COUNT:		8
    FILED AS OF DATE:		20180806
    DATE AS OF CHANGE:		20180806

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MESA AIR GROUP INC
    		CENTRAL INDEX KEY:			0000810332
    		STANDARD INDUSTRIAL CLASSIFICATION:	AIR TRANSPORTATION, SCHEDULED [4512]
    		IRS NUMBER:				850302351
    		STATE OF INCORPORATION:			NV
    		FISCAL YEAR END:			0930

    	FILING VALUES:
    		FORM TYPE:		S-1/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-226173
    		FILM NUMBER:		18993407

    	BUSINESS ADDRESS:
    		STREET 1:		410 NORTH 44TH STREET
    		STREET 2:		SUITE 700
    		CITY:			PHOENIX
    		STATE:			AZ
    		ZIP:			85008
    		BUSINESS PHONE:		602.685.4000

    	MAIL ADDRESS:
    		STREET 1:		410 NORTH 44TH STREET
    		STREET 2:		SUITE 700
    		CITY:			PHOENIX
    		STATE:			AZ
    		ZIP:			85008

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MESA AIRLINES INC
    		DATE OF NAME CHANGE:	19950426
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-1/A
    <SEQUENCE>1
    <FILENAME>d573709ds1a.htm
    <DESCRIPTION>S-1/A
    <TEXT>
    Document 1 - file: d573709ds1a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1.1
    <SEQUENCE>2
    <FILENAME>d573709dex11.htm
    <DESCRIPTION>EX-1.1
    <TEXT>
    Document 2 - file: d573709dex11.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.1
    <SEQUENCE>3
    <FILENAME>d573709dex41.htm
    <DESCRIPTION>EX-4.1
    <TEXT>
    Document 3 - file: d573709dex41.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-5.1
    <SEQUENCE>4
    <FILENAME>d573709dex51.htm
    <DESCRIPTION>EX-5.1
    <TEXT>
    Document 4 - file: d573709dex51.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.11.1
    <SEQUENCE>5
    <FILENAME>d573709dex10111.htm
    <DESCRIPTION>EX-10.11.1
    <TEXT>
    Document 5 - file: d573709dex10111.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g573709dsp17.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g573709dsp17.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g573709ig1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g573709ig1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g573709ig2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g573709ig2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>