what about Public Relations to improve the Load Factor of an Aircraft for a certain route??
An Airline needs staff like Pilots Stewardess an Boarding staff - maybe you can creat a Job Center where you can employ workers with diferent education? So with more friendly personell my airline gets a better publicity.
An other Idea is the Stock market where you can buy Stocks of other airlines and maybe you can take over. - But i read it's on work?