I'm totally with Justin and Chris on this...Three points:
1. Peter sez: "Guys its better this way then getting a badinfo rejection isnt it"
Yes, I would have to agree there. But why would a photo be rejected if you don't know the reg? It says if you don't know it to leave it blank.
2. IMHO it makes the photographer look unprofessional.
3. Andy sez: "Actually, several Air France 747s were operated with N registrations for quite some time"
True, and that leads me to this point...Take a look at this photo of mine that the N***** was added to: View Large View Medium
Photo © Brian Stevenson - SPOT THIS!
Now, speaking hypothetically, couldn't this aircraft been leased from a company w/ a F or EI or any other prefix reg? So how would you know for sure that a a/c is truly a N reg?
I honestly think that a strong majority of photographers would be in favor of doing away with this.
Just my take,