In article ,
Ron Wanttaja wrote:

[snip]
Not sure if it's that simple. There are other Cs, Ps, and Bs out there, too.
There are 457 Cirrus aircraft with 2004 model years, plus 144 Pilatuses
(Pilati?)
[snip]

I asked my dad what the plural of Stearman was...

he said "PT-17's"

;-