Air Asia: It serves complimentary alcohol, but note that this is route depending
Air Berlin: The alcohol only available for purchase in economy but complimentary for upper classes
Aegean Airlines: It serves complimentary alcohol for all classes except domestic flights
Air Canada: It serves complimentary alcohol for all classes except on domestic flights
Air China: It serves complimentary alcohol for all classes
Air France: They claim they to be only airline serving free champagne in all cabins!
Air India: It serves complimentary alcohol for all classes
Air New Zealand: It serves complimentary alcohol for all classes, including some domestic flights
Air Alaska: Alcohol is only available for purchase in economy, but complimentary for premium