Due to this high prevalence, vertebral artery hypoplasia (VAH) has not yet been considered an independent risk factor for ischemic stroke [1,2].
How to use your own headphones on Americanâs new 777-300ER. Passengers traveling in First and Business Class on Americanâs new 777-300ER are provided with Bose QuietComfort 15 Acoustic Noise Canceling headphones to use during the flight.
The A20 Aviation Headset is engineered to be more comfortable and provide more noise reduction than any headset weâve ever made, while still delivering the clear audio you expect from Bose. There are more features than ever, and at just 12 ounces, itâs still one of the lightest active noise cancelling headsets out there.