Because a flying lizard is totally magical.
If we're going to remove whatever logic is left the Fighter Plane is now starscream.
Starscream can be anything he wants. But since logic is removed the dragon is one million feet long, just one huge cord of strength. Shoots flame reac...
I think I'll resort to logic.
Since the Dragon is Mythical it is a matter of opinion. But I believe a dragon could destory a plane for breakfast, lunch, supper, and a midnight snack.
Since fighter planes are like eggs. Crunchy outside, and a soft chewy and runny inside.
Edit :: Just thinking, if a dragon got right behind a jet, the jet would be screwed.