I am trying to work out the emotional attachment you guys have to a number?
This could be the subject for a doctoral thesis. You've got a savant like Rainman, who could rattle off page after page of the phone book. And also happpened to know the air safety statistics for Qantas.
Then there was the Railwayman character, subject of a recent movie, whose knowledge of railway timetables was staggering.
But more ordinary brains do retain a mass of numbers relating to motor cars and aeroplane types. What really impresses is the way certain engineers and others knowledgeable about aero engines can retain the strings of numbers and letters pertaining to a particular engine.
Remember though, the good healthy minded aviator type will always be fascinated to know (and appreciate) certain vital staistics.