Originally Posted by
Stripe
So is that the distinction? International flights are stocked with duty free liquor which can't be served on the ground?
Yes, exactly.
State law is highly unlikely to discriminate between a domestic and international flight. But the practical impact is different, since no tax is paid on the alcohol in the trolleys for international flights - so this alcohol can only be served once in the air. Whilst on domestic flights tax is paid so there are no tax-related restrictions on serving whilst on the ground.