According to 2026 FAA and TSA regulations, the highest proof of alcohol allowed on a plane is 140 proof (70% alcohol by volume). Any alcoholic beverage exceeding this limit, such as certain high-strength rums or 190-proof grain alcohols, is strictly prohibited in both carry-on and checked luggage because it is classified as a flammable hazardous material. For beverages between 24% and 70% ABV (48 to 140 proof), you are limited to a total of 5 liters per person in checked baggage, and it must be in its original, unopened retail packaging. In 2026, alcohol under 24% ABV (like most wines and beers) has no volume limit in checked bags, though weight restrictions for the suitcase still apply. In your carry-on, the standard 3-1-1 liquids rule remains in effect: you can only bring "miniature" bottles of 3.4 oz (100ml) or less, provided they fit in a single quart-sized bag. Most importantly, it remains a federal offense in 2026 to consume your own alcohol while on board the aircraft.