Had an interaction with them during a Delta flight which was cancelled. I was re-booked with Air France, told to show up at CDG and they would take care of the rest. The staff at Air France desk was infuriatingly unhelpful.
Delta isn’t any better. They rebooked me while I was in the air and I only found out when I went to my connecting flight gate to be told I wasn’t on that flight. Still waiting to hear back from them…