[scottinoc]

X15 is not air-breathing, so nope. Coolest rocket plane ever though.

[tophat9000]

Well a gliders is not “air breathing” either

I think we’re talking about if it’s a ballistic flight vs non ballistic flight

The x15 and space shuttle are ballistic to altitude and poweless glide return

[Paradox]

X15 is not air-breathing, so nope. Coolest rocket plane ever though.

It said nothing about air breathing, and technically neither is the glider, it said for fixed winged aircraft. You could say the space shuttle went even higher, but at those altitudes it isn't "flying".