Hmmm... Might not work for me, then. I was asking for the purposes of a Crimson Skies formation, but given the accelerated rate of aviation development and the sheer amount of skirmishing combat experience everyone has in that setting, triples are likely a thing of the past for pretty much everyone in the 'now' of that setting's 1937.
Guess my Ontarioans (?) need a 4th plane, then. Thanks!