http://forums.eagle.ru/showthread.php?t=109847&page=106
"FREE for everyone:
P-47
Spitfire
Bf.109K
Paid on release
P-51 (from DCS World)
FW-190D (from DCS World)
If you back at a $20 level, you can pick a P-51 or FW-190D.
If you back at a $40 level, you will have both.
If you already own a DCS World P-51 and/or FW-190, then obviously no one wants you to have to pay for anything twice.
If we reach stretch goals, then the story changes.
Free aircraft list will most likely not change.
Backing at $20 still gets you one of the larger variety of paid aircraft.
$40 or above still gets you ALL of the initial flyables.
None of the aircraft released in future updates are covered by any of this"