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.
We recommend noise cancelling headphones specifically for airline, train, or bus travel, but for many other noisy environments a closed headphone or an in-ear headphone can potentially block more sound and can deliver better sound quality for the price.