Bars selling alcohol 24/7 at the airport, bars selling alcohol 24/7 in the departure lounge, duty-free shops selling cut price alcohol in the departure lounge, cabin crew pushing alcohol-laden trolleys up and down the aisle during the flight.
Shock and outrage that some people get drunk.
Short of misting it throughout the plane via the air conditioning, I can't think of anything else they could do to get any more alcohol into the passengers.