You'll never get enough air at Flugplatz to not be able to turn in for Schwedenkreuz. But you must be on the right line before you get air. If you are going in the wrong direction in a fast car you often won't have enough time to get back on the right line to be able to turn in. The entry point for that corner is extremely precise. So... if you are headed to the left side of the track when you catch air, slow down more so you can take the corner.
If you mean Quiddelbacher-Höhe(the jump slightly earlier before the right turn), that one is a bit closer to the corner and so in some fast cars I find you do need to actually start to decelerate before you hit the crest. Braking in mid-air doesn't really help matters.
Not that I don't crash in both places plenty. I'm not sure if there are any corners left on the Nordschleife I haven't crashed at. But I have seen a lot of people try to force the issue at Schwedenkreuz when there is no possible way they can take it, even though they could easily get through if they would just back off.
EDIT: For me I'd say my bane is probably the chicane at the very end. There's plenty of corners I mess up, but that's the one I'm most likely to just plain kill myself at. For a long time I basically considered it a "controlled crash" so I focused on just surviving it, to hell with the time. But eventually I learned to take it correctly so now I still crash there because I'm always trying to go too fast.