Was going to post in struggle thread, but I only lost a day, so I'm counting it as an inconvenience.
My mom and I were supposed to fly out of Japan on Friday evening. Instead we were subjected to the biggest comedy of nonsense I've ever experienced in 20+ years of international flying. We were delayed at the gate, taxied to the runway, returned to a different gate, delayed again, asked to deplane, told not to wander, and then finally had our flight canceled. Four and a half hours on the plane and three more in the airport by the time they reverse processed the immigration paperwork. The ground staff were utterly incompetent. We got home at 01:30.
The replacement flight was stellar. We shipped out on JAL instead of United and everything was perfect. It was one extra hop, and through the most loathsome of airports: LAX. Still, it got my Mom home, and we are finally settled.