Thanking calvinus for tips I put hands over Leader.EXL file.
I'll give a first glance to Aircorps Aces, looking for respective entry date and for more aces to be added.
I'll return modded Leader.EXL file to calvinus or anyone in charge when done.
I know at moment WWI may have other priorities.
On my own I never tried the game yet: I installed it only to get the Leader.EXL file.
I will not bother WW1 development team. I know they are very busy: just when possible let me know if will be possible in the past to include portraits of leaders; aces in particular!