You can legally transport your own alcohol in your carry-on or checked bags, but you are strictly prohibited from consuming it on board the aircraft. FAA and international aviation regulations (such as 14 CFR § 121.575) mandate that passengers may only consume alcoholic beverages that are served to them by the airline crew. This rule exists for safety: flight attendants must be able to monitor a passenger’s alcohol intake to prevent intoxication-related incidents. In 2026, airlines have become even stricter with enforcement; if you are caught "pouring your own" from a duty-free bottle or a flask, you face potential federal fines ranging from $500 to over $40,000, along with a permanent ban from the airline. If you have alcohol in your carry-on (such as miniatures that meet the 3-1-1 liquids rule), they must remain sealed and stored for the duration of the flight.