As the title says, United Unaccompanied Minor was placed on the wrong flight and it wasn't noticed by the airline (Eurowings) until the plane left the gate and was taxiing. I've not sent any of my kids as a UM but surprised me that the mother's communication plan to United was via Twitter. Maybe that was one of many ways she was trying to contact them. I sort of guessed there would be some dedicated phone number for UMs but honestly have never looked into it.
https://simpleflying.com/united-unac...minor-mistake/