Exhibit 99.1 ALLEGIANT TRAVEL COMPANY FIRST QUARTER 2024 FINANCIAL RESULTS First quarter 2024 GAAP diluted loss per share of $(0.07) First quarter 2024 diluted earnings per share, excluding special charges of$0.57(1)(4)(5) First quarter 2024 airline only diluted earnings per share, excluding special charges of $1.08(1)(4)(6) LAS VEGAS. May 7, 2024 — Allegiant Travel Company (NASDAQ: ALGT) today reported the following financial results for the first quarter 2024, as well as comparisons to the prior year: Co ...