Its not a Helicopter??

I'm going to go out on a limb and guess C-124.
That row of windows and the drop ramp PLUS clamshells is really confusing me.

Not a C-124, but on the right track?????

A clue "Double decker"

Could carry 400 fully equipped troops.
Think big!

C-17 Globemaster?

This one uses propellers??????????????

It's a C-133, though it took me forever to find any photos of it with clamshelll doors like that. It's one of only three that was modified to carry Titan missiles.

Good try, but this aircraft took to the skies a decade before the C-133 ??

So no stewardess this week.
And the answer
LINK - http://en.wikipedia.org/wiki/Convair_XC-99