By coincident i visited Simhq and saw a thread there and did folow th link to the combatplanes site, i know there was a long time ago some "uproar" because they did sell mods and as it looks by now they do work together with 1X they do advertise both "Addons" which 1X does sell so finaly for me the secret from where the addons do come is liftet.
http://www.simhq.com/simhq3/sims/boa...f=129;t=001590