OK. I found out how to get the AV-8B Harrier for the US in LOMAC...
GOTCHA!
This is a super fun thing to do in the default planes though.
1. Go into mission editor.
2. Select a plane, preferably a light one (SU-25) but a heavy one (SU-33/F-15) works just as well. You will be the pilot.
3. Take off any armament and set fuel to 20%.
4. Go into the weather settings. Set wind at ground to 50 m/s, heading, 0/360.
5. Set your plane so that it is on the runway at Sevestapol (?). Now take off, you should be flying into the wind. Enjoy your new
VTOL Su-25/Su-27/Su-33, MiG-29A/S, A-10 or F-15.