Originally Posted by
Frequentlander
OK, the fact that they use prime number for registration, just completely made my day.
I thought I’d check how many aircraft they could register with the same format using NxxxAZ, where xxx is a prime number. As you can’t have leading zeros in xxx as defined by the FAA, there are 143 prime numbers between 100 and 999, assuming they can use them all if they haven’t already been issued to other aircraft.