Airplanes

Companies wanting to save money

Natural disasters (hurricanes, tsunamis/earthquakes taking over the airport, etc.)

wind shear

@j88q said in #2:
> Osama bin Laden
Bruh

If you mean "causing accidents", what @Al-Ghoul said.
If you mean "disrupting air travel", volcanoes.

civilian drones

No more oil

Dumbness.

hello 911