Just flew BA in J from CDG to LHR. We were in the air for about 40 minutes, and received an afternoon tea service with sandwiches, warm scones, and full beverage service. Approx. 25 passengers in the cabin.
Theres really no no reason why AS can’t provide a drink service in F on short flights.
That being said - it is not part of the advertised service so it shouldn’t be an expectation.