It's hard to say, I talked to Andy way back in October 2012 and he said as of that date there were no plans to do any more WW1 aircraft, but like I said that was as of that date and many months have passed since then. From a personal standpoint there are many more WW1 related things I would like to see released before we see more aircraft. Early war French cavalry, a 75mm gun, more German, French, and British infantry in action, are all desperately needed for the Western Front series. That's not to say more airplanes (especially Allied planes) wouldn't be cool, I just feel there are more pressing needs for this line.