Interesting flyer related note:
When Canada switched from imperial to metric measurements a major error was made on an Air Canada Flight from Montreal to Edmonton with a stop in Ottawa.
Air Canada Flight 143, a 767, ran out of fuel flying near Winnipeg.
The result was a truly harrowing story about the "Gimli Glider."
http://www.youtube.com/watch?v=D5AK6TG5zA4