WTF Untrue by a mile most of any aircraft uses composites and aluminum , titanium, and Titanium by products...
Only place they use steel is in Coils in ; landing gear and landing frame area where most of the body weight goes to so they add steel there
Can not imagine , full steel plane being build ???? it never get off the ground.
From being so out of wack as warped From heat and welding frame work
I may not be building full scale version but couple sizes down but same prints and presently on landing gear
But your Right Steel cannot fly
Damn could you imagine ???? 911 steel plane, hitting steel Building???? Should of took out all of New York easily . And funny thing is you would all fall for it