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.
QCÂ®25 headphones let you focus on what mattersâyour music, movies and videos. And they reduce what you don't want to hear. Like a crowded city street. Cabin noise inside an airplane. Or a busy office. Advanced noise reduction technology and unique electronics make it happen.