"Faulty speed readings and electronic failures were cited by crash investigators yesterday as they said they were closer to understanding the loss of Air France Flight 447 on June 1, with the deaths of all 228 people on board."

As the above news report states,some jet airliners may have faulty electronics that fail to indicate the accurate speed at which an airplane is actually travelling.Maybe this faulty instrument speed reading could be checked against a reading of the airplane's Global Positioning Satellite system readings? The distance an airplane is travelling between two points,as indicated on its GPS could easily be calculated to show the airplane's actual air speed between those two points! Pilots could take a GPS reading on their present location in reference to another previous GPS location at different time intervals from one minute to one hour etc. to calculate just how fast the aircraft is travelling between those two points.This data of course would be calculated a computer program or even by the manual use of a calculator by the pilots.It would be just one more safety tool to help pilots determine the actual speed at which they are travelling no matter what the outside conditions are!