In April, I had an AA ORD-NRT flight that was scrubbed about an hour into the flight and returned to NRT due to it being too cold in the cabin. I had never experienced or heard of anything like that happening before. Where I was sitting, it was on the cool side, but I like it that way. When the FA told me that we were going back to Chicago, I told her that my Mom had always told me to "put on a sweater" if I was cold rather than turn up the thermostat - the FA smiled but said that there was something really wrong with the aircraft and that in certain sections of the cabin, it really was too cold for people to bear for 12 hours. So, we went back to Chicago and swapped aircraft and crew.

That resulted in a 5+ hour delayed arrival into NRT, killing most connecting passengers' onward connections, and even making travel into Tokyo difficult. That had to have been a very expensive diversion for AA.