However an airline can set a higher drinking age than the legal minimum of their home country. For instance Lufthansa's minimum age is 18, even though 16 year olds can drink beer in Germany.
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Alcoholic beveragesAlcoholic beverage selections vary by flight and cabin. Alcoholic beverages are complimentary in premium cabins on all flights and in United Premium Plus (flights to Hawaii and on premium transcontinental flights).
Adolescents aged 16 and over are allowed to buy and drink beer, wine or sparkling wine also in absence of their parents, but other -heavy- alcoholic drinks are not allowed for them either. From the 18th birthday, a person is considered an adult in Germany.
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).
Belgium, Denmark and Germany set 16 years as the minimum age for purchasing beverages containing less than 1.2 % of distilled alcohol and 18 years for buying spirits (more than 1.2 % of distilled alcohol). Sweden set the minimum age for purchasing beverages with more than 3.5 % of alcohol at 20 years.
Drinking in SpainHowever, those under the age of 18 can buy beer or wine if they are with their parents, and there's no minimum age for drinking alcohol inside the home, so it's up to parents to decide whether they think their child should be allowed to drink.
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.