Exhibit 10.78

[***] Certain information in this document has been excluded pursuant to Regulation S-K, Item 601(b)(10). Such excluded information is not material and would likely cause competitive harm to the registrant if publicly disclosed.
The Boeing Company
P.O. Box 3707
Seattle, WA 98124 2207


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WJE-PA-05130-LA-2302594


Allegiant Air, LLC
1201 N. Town Center Drive
Las Vegas, NV 89144


[***]: [***]

Reference: Purchase Agreement No. PA-05130 (Purchase Agreement) between The
Boeing Company (Boeing) and Allegiant Air, LLC (Customer) relating to
model 737-8-200, 737-7 aircraft (Aircraft)

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement will have the same meaning as in the Purchase Agreement.

1.Definition of Terms:
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2.[***]
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5.1[***]
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ACCEPTED AND AGREED TO this
Date:November 14, 2024
Allegiant Air, LLCTHE BOEING COMPANY
By:/s/: Robert NealBy:/s/: Alan Luan
Name:Robert NealName:Alan Luan
Title:CFOTitle:Attorney-In-Fact
















Attachment A
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