21.   Cellphone use is prohibited on most commercial airliners while a plane is in flight.

22.   Commercial airliners are equipped with audible cockpit warning alarms that will sound when the loss of cabin pressure exceeds pre-established limits, said FAA spokeswoman Kathleen Bergen.

23.   Commercial airliners are not commodities.

24.   Commercial airliners in the United States have several classes of cargo holds and many have fire detectors.

25.   Commercial airliners tend to hold their value longer than corporate jets.

26.   Fatal crashes on commercial airliners are rare.

27.   Flight Simulator also got some attention last week because of speculation that the realistic software might have helped the terrorists learn to fly commercial airliners.

28.   Fuel tank explosions have contributed to at least two other recent deadly incidents on commercial airliners.

29.   He also was an avid pilot licensed to fly all types of aircraft, including commercial airliners, helicopters and hot air balloons.

30.   He loved to go into the cockpit of a big commercial airliner and look at the magnificent instrument panel.