Introduction of Air-shift T case and Air Assist Powersteering?

Was thinking about this the other day, when was the Air-shift transfer case and air-assist power steering introduced? I am going to guess the T case came first and was more widely adopted then the power steering.

Thanks

The air t-case came around sometime around 1970.

I don't think the air steering came around as standard equipment until maybe the late '80s A2 or A3.