I'd really love it if iOS 11 brought back the years old (and long since removed) feature of offering to turn on airplane mode when I plug in my phone to my car stereo. I don't have BT in my car so I plug it in using the stereo's iPod input and cable going into my iPhone Lightning jack. Back when I had a 3GS it would ask if I wanted to turn on airplane mode, and then automatically turn it off when I unplugged the phone at my destination. I've missed that feature ever since then, because I'd rather not be bothered by texts and calls while driving.