Anything, literally anything could happen while your up in the sky. Maybe a zombie apocalypse (childish) occurs, turbine Suddenly explodes, fuel runs dry, hijacking, i Tried to come up with more but that’s all i got. Putting the zombie suggestion aside what about the other 3 those are major priorities to look over? How did they manage to keep plane engines and turbines from ever exploding again, do they refuelevery time a new plane enters the airport, how do they not screw up when it comes to refueling, how good has TSA gotten at finding weapons and detecting bad guys since it was first established?