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+1-888-413-6950 When packing for an Allegiant flight, you must adhere to TSA's 311 carry-on liquids limit. The usual TSA regulations are followed by Allegiant Air's carry-on liquids size limit for all liquids. Aerosols, gels, and liquids of 3.4 ounces (100 milliliters) or less may be carried by each traveler.



