The answer to this puzzle is a vehicle or a type of transportation. It is created by using simply parts of air, a noble metal and a heavy metal. What is it?
Edit: I've found a better fit.
W - Tungsten, one of the densest metals in the periodic table
Ag - Silver, one of the noble metals
O,N - Oxygen and nitrogen, the two most abundant gases that make up our atmosphere
Assume we're spelling things out with chemical symbols, the only thing even close that I've found so far is
But this isn't a perfect fit:
He and CO can be in the atmosphere, but neither is present in great abundance.
Li doesn't fit any of the clues. This is my biggest problem with this answer.
Pt is a noble metal and fits that clue just fine.
Er is a metal with a high atomic weight, but it's a lanthanide and not what I'd normally think of if someone says a "heavy metal".