Perhaps the pilot procedures take x amount of time - which is fixed. Whether boarding takes x, or x-10 minutes wouldn't change the ability of the flight to lea

Perhaps the pilot procedures take x amount of time - which is fixed. Whether boarding takes x, or x-10 minutes wouldn't change the ability of the flight to leave. There is also landing/takeoff slots, which are outside the control of the airline. All in all, I doubt boarding faster would help an airline fly a plane more often.