Together with service class, how about more actual physical classes or physical facility in the carbin? Like premium economy, sleeper class seen on 1950 airlines, lounge for first and/or business class passengers, suite class, etc.. Premium econnomy can be made by simply making an extra class inbetween business/economy and allow players to define seats/service/etc. in the game, but other physical classes require additional options in the game
Frequent flyer free upgrade when business class getting low load factor while economy class full?
For raising capital - how abouot bonds?
Can we transfer aplane to other companies but then lease back the plane without requiring rescheduling?