Join Date: Jul 2001
Location: Near Pittsburgh, Pennsylvania, USA, Earth (PIT)
Programs: Airline/TSA Avoidance Platinum, Hotel Disloyalty Silver, Hertz 1.7*
Posts: 5,277
Seems like they've pretty well standardized on single-prong electronic headphones on every plane with audio. The only exception I've experienced recently was a 727 which had the air-type headphones. The 777s for transatlantic has used single-prong electronic headphones since they first got them. Can't confirm for other widebody types; been a long time since I've been on a UA 767 or 747.