They didn't. You asked when a letter could be a number. I answered.

Jim






"Steven P. McNicoll" wrote in message
link.net...

"RST Engineering" wrote in message
...

When you count in hexadecimal. The hexadecimal digits are 0 1 2 3 4 5 6
7 8 9 A B C D E F


When did Canada begin using hexadecimal for aircraft registrations?