I’d like to see option for airlines to do longer-term scheduling than a week or so at a time. Options could include year-round or seasonal, with preferential arrival times. In other words, an airline could request a 3 pm arrival time and pay $3,500 – but pay $2,750 if you schedule them in at 3 am. In any event, this would allow sometimes for some predicability in scheduling.
To make things a little more fun and complex would be the addition of charter flights. Airlines you have a signed contract with might want to do one-off (or a very limited run) of flights at a higher rate than usual – $5,000 rather than $3,500 for example – but with specific requirements, such as the flight must arrive and depart at a specific time (unlike regular flights).