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.
1 Lightweight but sturdy materials and a unique folding design make Beats Executive headphones easy to carry for incredible sound anywhere.  Active Noise Cancellation (ANC) and custom EQ deliver pure audio that is free from external disruptions and exceptionally clear.