You shouldn't need an adaptor, just plug in the 3.5mm jack from your headphones into the 3.5mm socket and they should work just fine. It works for my Bose noise cancelling headphones.
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The simple answer is that having a dedicated airplane headphone adapter is still very much a good idea in 2023. Airplanes almost always use a “Double-Pin” port for their entertainment systems, which can spell trouble if you want to try and connect your device through a “single-pin “cable!
Meanwhile, economy boarding groups stretch to Group 9. Universal power outlets: The recent refresh to British Airways economy cabins only provides USB power outlets in economy. However, you'll still find two universal power outlets between each pairing of World Traveller Plus seats in addition to a USB outlet.
AIRLINE ADAPTERThe airplane adaptor allows you to connect your own wired headphones with a 3.5mm audio jack to the plane's entertainment system that uses the dual socket connector.
Modern AC and USB EmPower OutletsEmPower is a 120 volt universal connector type found on many commercial airlines designed to provide power to travelers' electronic devices.
According to the Federal Aviation Administration (FAA), Bluetooth headphones and other wireless devices are allowed during all phases of the flight, as long as they are in aeroplane mode. In general, you can use your trusty wireless Bluetooth headphones on planes. Photo by cottonbro studio on Pexels.