Republic Airways Holdings Inc.

Mesa Air Group, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 to report that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended September 30, 2025 (the “Quarterly Report”) within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company anticipates that it will be able to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii)

Certain information required in Mesa Air Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (the “Quarterly Report”) necessary for an accurate and complete report could not be provided within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company will use its best efforts to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [] Yes [X] No The Company has not filed its Quarterly Report on Form 10-Q for the three months ended December 31, 2024. (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 [X] No 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 thereunto duly authorized. 2 Date: May 14, 2025 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer 3

Certain information required in Mesa Air Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2024 (the “Quarterly Report”) necessary for an accurate and complete report could not be provided within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company will use its best efforts to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [] Yes [X] No The Company has not filed its Annual Report on Form 10-K for the fiscal year ended September 30, 2024. (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 [X] No 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 thereunto duly authorized. 2 Date: February 14, 2025 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer 3

Certain information required in Mesa Air Group, Inc.’s Annual Report on Form 10-K for the fiscal year ended September 30, 2024 (the “Annual Report”) necessary for an accurate and complete report could not be provided within the prescribed time period without unreasonable effort or expense. The Company anticipates that it will be able to file the Annual Report within the 15-day time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [X] Yes [] No (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 [X] No 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 thereunto duly authorized. Date: December 30, 2024 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer 2

Mesa Air Group, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 to report that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended June 30, 2024 (the “Quarterly Report”) within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company anticipates that it will be able to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [X] Yes [] No (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 [X] No 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. 2 Mesa Air Group, Inc. (Name of Registrant as Specified in Charter) has caused this notification to be signed on its behalf by the undersigned thereunto duly authorized. Date: August 9, 2024 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer 3

Mesa Air Group, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 to report that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 (the “Quarterly Report”) within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company anticipates that it will not be able to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [] Yes [X] No The Company has not filed its Form 10-Q or the quarter ended December 31, 2023. (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 [X] No 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. 2 Mesa Air Group, Inc. (Name of Registrant as Specified in Charter) has caused this notification to be signed on its behalf by the undersigned thereunto duly authorized. Date: May 10, 2024 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer 3

Mesa Air Group, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 to report that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended December 31, 2023 (the “Quarterly Report”) within the prescribed time period without unreasonable effort or expense. The Company requires additional time to finalize its financial statements for such quarterly period. The Company will use its best efforts to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). P ART IV — OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification: Michael J. Lotz (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 reports) been filed? If answer is no, identify report(s). [X] Yes [ ] No (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 [X] No 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 thereunto duly authorized. 2 Date: February 9, 2024 By /s/ Michael J. Lotz Name: Michael J. Lotz Title: Chief Financial Officer DOCPROPERTY DOCXDOCID DMS=IManage Format=<<LIB>>\<<NUM>>.<<VER>> PRESERVELOCATION \* MERGEFORMAT ACTIVE\1607139522.1 3

Certain information required in Mesa Air Group, Inc.’s Annual Report on Form 10-K for the fiscal year ended September 30, 2023 (the “Annual Report”) necessary for an accurate and complete report could not be provided within the prescribed time period without unreasonable effort or expense. The Company anticipates that it will be able to file the Annual Report within the 15-day time period prescribed in Rule 12b-25(b)(2)(ii)

Mesa Air Group, Inc. (the “Company”) is filing this Notification of Late Filing on Form 12b-25 to report that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 (the “Quarterly Report”) within the prescribed time period without unreasonable effort or expense. The Company anticipates that it will be able to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii). The delay is the result of the Company requiring additional time to finalize matters related to the removal and sale of aircraft and associated write-off

Certain information required in Mesa Air Group, Inc.’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022 (the “2022 10-K”) necessary for an accurate and full completion of the report could not be provided within the prescribed time period without unreasonable effort or expense. Mesa Air Group, Inc. anticipates that it will be able to file the 2022 10-K within the time period prescribed in Rule 12b-25(b)(2)(ii)

Certain information required in Mesa Air Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 (the “Quarterly Report”) necessary for an accurate and full completion of the report could not be provided within the prescribed time period without unreasonable effort or expense. Mesa Air Group, Inc. anticipates that it will be able to file the Quarterly Report within the time period prescribed in Rule 12b-25(b)(2)(ii)