Airline/Airport relationship
The two groups have differing needs and therefore there will be friction. The airlines want to get into an airport, offload, onload and depart as quickly as possible. They want their passengers to check in quickly and go to the gate and board. They want baggage and freight delivered to the aircraft promptly.
Airports make money out of passengers spending as they go through the airport so they put shops and other attractions in the way to delay people going through to the aircraft.
Airlines plan for next season or maybe next year. Airports have to plan 10 years ahead to get through the planning and construction processes. Ask an airline what aircraft it will be using 10 years ahead and they have no idea.
Airport managers are generally bureaucrats who don't meet passengers. Airline managers at airports are operational people dealing with the next turnround. The two jobs need different types of people.