Can a 19 year old drink on an international flight?
The law of the country whose airline you're flying applies. If you fly United Airlines to Australia, you need to be 21 to drink.If you fly Qantas, you can drink at 18.If you fly American Airlines to Mexico, you need to be 21 to drink.
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If you're under 21, U.S. carriers are a no-drinking zoneThe FAA doesn't police in-flight drinking, but airlines certainly do and typically follow the laws of the country in which they're based.
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.
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.