I have just purchased HAWX2 on the PC, taken home and installed. The first thing I did was to have a look in the PAK files and this is a list of the playable planes. Obviously the PAK file is encrypted, but you can still see the contents but not actually extract them.
As you can see the Korean and Vietnam War DLCs are on the disk already (in <span class="ev_code_RED">Red</span> and <span class="ev_code_YELLOW">Yellow </span> respectively), as is the new Russian stealth fighter the PAK-FA.
Playable planes in HAWX 2:
A-10 Thunderbolt II
AC-130 Spectre gunship
F-16C Fighting Falcon
F-35 Lightning II
<span class="ev_code_RED">F-4E Phantom II</span>
<span class="ev_code_YELLOW">F-86 Sabre</span>
F-18E Super Hornet
<span class="ev_code_YELLOW">MiG-15 ***ot</span>
<span class="ev_code_RED">MiG-21 Fishbed</span>
Su-30 Flanker C
Su-35 Super Flanker
I am wondering how easy it would be to import in the missing Viggen and Draken from HAWX 1.