They made a small update that seems tailor made to my needs. When you're listening to something on Bluetooth headphones and put the phone in airplane mode it will keep the BT radio on and continue playing what you're listening to, on iOS 10 and earlier it would kill the BT radio and you'd have to manually turn it back on while in airplane mode. This is a great convenience for me because I put my phone in airplane mode while heading into the gym because otherwise it burns battery trying to find a signal.