In one of the endings V takes a Delamain AV to go to a location. I think the one in the garage maybe foreshadowing that event. So, by the end of the game Delamain’s AV service is already active. But because you cant play after that time period you can never use them. If the dlc take’s place after the events involving V those AV could be available.
Can't really have 'Blade Runner' without flying cars but the adrenaline is only there if you can pilot them yourself. Right now my rush is speeding around Night City by bike and trying to perfect my riding skills without hitting anything or anyone