Old Jul 11, 10, 6:31 pm
Join Date: Apr 2005
Location: PHX
Posts: 3,796
The Delta 757 I flew on last week (first flight 1990) still had a pneumatic socket in addition to the two-prong electronic socket. Too bad I didn't have your set with me, I could have seen if it still worked.

Lightweight Walkman-style headphones killed them off; prior to that, all headphones were the jumbo over-the-ears type. The pneumatic system let them leave the bulky speakers in the armrest.
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