You've been able to "d/l" planes at least since 1990 when 4.0 was released
Check flightsim.com
and
planetfs.com
they have the best selection of craft. Remember, you can use fs2000 planes also. There is a harrier somewhere, I had it but erased all my planes when I built the new rig and started over (had a lot of junk, just want the good ones).
Get the x-wing, bastard goes big fast and is great for just looking around.