I don't know. I did hard by just running the campaign. But I will say this I went back in FF to unloock the last ace F-22. And did and I could purchace it then. Then I went back to play normal mode to get the quick silver medal. Well after I beat the first mission the second (Estovakian pattern) super 44 becane unlocked. Now I don't know what I did nor do I recall what the criteria for that model are, but that says to me you can probably do everything to unlock a plane in FF but you need to be in campaign mode for the game trigger to go off and give it to you.

You do have to be in campaign mode straight through to get certain medals though (not includeing the all S medals).

Ahh mission 13 I was stuck on that one a long time too. As you've probably figured out to get the S on the second part its not about killing him fast its about points by killing drones. I don't know what the guide says but I had to kill about 30 drones and I think I got an A, maybe a B, before my overall grade rounded up to S. Just fly the super 44 with multi missle and circle near the return line so you can duck out if things get too hot and get more missles quickly. And don't hit the ACe guy cause something you can hit on him will make the drones dissapear.

There have been SR 71s to shoot down in previous games though I can't recall one in 6. Doen't mean its not there.

You got to fly one in AC3 at that rocked.