[1] Loss of control may be due to excessive altitude for the airplane's weight, turbulent weather, pilot disorientation, or a system failure.
[4] Loss of control as a factor in aviation accidents came into the spotlight with the 1994 crash of USAir Flight 427, which killed all 127 passengers and 5 crew members on board.
[7] New FAA rules are expected to be finalized in 2010[needs update], requiring specific training for pilots to recover from aircraft upset incidents.
The Royal Aeronautics Society states: "An upset is not necessarily a departure from controlled flight (i.e. a stall/spin) but it also includes abnormal attitudes and gross over/under-speed conditions.
"[10] Calspan, which has been involved with upset research and training since teaming with NASA in 1997, holds that the generally accepted industry guidelines are incomplete in that they only take into consideration aircraft attitude and airspeed.
With the phasing out of piston-driven propeller airliners, that phrase has gradually given way to "loss of control-inflight", which includes, but is not limited to, the upset/high-speed dive type of accidents.