Any given night on United you can choose from ” Delayed due to a late inbound aircraft arrival” or “Delayed due to aircraft maintenance.”
Tuesday night I got both and completed a trifecta with an added dollop of air traffic delay after the plane arrived late and then broke down.
Tonight so far I am choosing from a menu of one each, but the night is still young, only 11 pm in San Francisco, I may still be served a fusion dish.
The mechanical one has better seats. The agent said, “Stick with a plane where there is a better chance it will get out.” Now that’s confidence.