Fuel dumping: a procedure used by aircraft in certain emergency situations before a return to the airport shortly after takeoff, or before landing short of its intended destination (emergency landing) to either lighten the aircraft’s weight or to reduce risk of fire.
In flight refueling: or air to air refueling, air refueling, tanking, is the process of transferring fuel from one aircraft to another during flight.
Turbulence: violent or unsteady movement of air or water Fumes in cabin: smoke in the cabin