I own a couple of DJI Phantom drones. (No, it wasn’t me.) They fly for about 25 mins, and I have an aftermarket kit that gives me a range of about 5 km.
I remember when I got my first one, there was nothing in the drone preventing me from flying over an airport. However, there is a GPS system in them, and there were software updates a few years ago that added a restriction of flying in restricted airspace.
At one point (and I suspect it was because ISIS started using drones as mini bombers in Syria), DJI sent out some software signal that prevented a takeoff unless the machine had the next software update. For me, it came without warning, when I turned one on, trying to use it in a remote location with no phone signal. (I was pretty furious.)
The point is, the only way you could fly a drone over an airport these days would be to hack into and modify the software of a drone. I am no expert, but I think that would be way beyond the ability of most drone users.