"L.D." wrote ...
I've heard all Boeing aircraft had a 7 in their model #, 707, 747,
PT-17, etc. except the B-52 and then even 5+2=7. Is this true ot not. I
know the KC135 doesn't have a 7 but it is a 707. Would that make the 7
in model #'s true?

There were many early Boeings without a '7'. The KC135 is not a 707 in any
sense but it was called the 717 for a while. That number has now been given
to the DC-9/MD80.

Rich