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.
After the plane is safely in the air, flight attendants check for passenger comfort. They deliver headphones or pillows to passengers who request them and serve food or drinks. In addition to serving the customers, flight attendants must conduct regular safety checks and listen for unusual noises.