I believe that AIR app is just a swf and resources in a zip. Used to be able to compile Zinc on a mac to run on windows as well. main problem back then was class path differences especially with winNT and win98 and mac. I presume AIR is not too different from zinc, so a c++ player that has swf player inside. In theory you could create a Cppia target for OpenFL. The cppia you compile would be cross platform and the player you have one for each target