The suit you have seen in the trailers is that of which the pilots use of the SR-71. (Fastest Military Jet in the world) The SR-71 flies so high up that the atmosphere is very thin and the suit is vital for the pilots survival. The plane was created as the first stealth jet. Unlike the B-2 bomber and other similar planes of today the stealth aspect was gained by it's 2400+mph speed. First flight was in 1964.
Hope I helped , oh and that's why it looks like the plane is in space in the trailer, iot's just really, really high up.
Have a read at the wiki article http://en.wikipedia.org/wiki/SR-71_Blackbird
its probably just a reference to the time period.