Can a 20 year old drink alcohol on an international flight?
If you're under 21 and want to drink on an airplane traveling outside the U.S., you're out of luck if you're flying on United, Delta, American or any other U.S.-based airline. But yes, you can find lower drinking ages on some airlines based elsewhere (emphasis on some; certain airlines don't serve alcohol at all).
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Whether domestic or international, you can usually order a drink on a flight before 12pm. This is unless it's an airline like Turkish Airlines, who don't serve alcohol on their domestic flights or an airline that doesn't offer this as part of their complimentary breakfast selection.
Yes, but you have to follow the reasonable quantities rules. This means you're exempt from the 3-1-1 rule limiting liquids to 3.4 ounces (100 mL). Pack formula, expressed breastmilk, or water for mixing with powder separately and be ready to let the TSA know you have it.
Under current FAA regulations, passengers aren't allowed to drink alcohol while flying unless it's served by a flight attendant. Your flight attendant also isn't allowed to serve you if you're intoxicated.
The drinking age on all U.S.-based cruise lines is 21 -- even when sailing international waters. (Under special circumstances, some cruise lines allow 18- to 20-year-olds to purchase and consume alcohol with a parent's consent.) Regardless of the policy, you should never buy a drink for someone under 21.