That makes sense and may be some of the problems. Who knows, it is AA and as a lot of what they do makes little sense.
Two times last week the early morning flight from DAY to CLT was delayed from 3 hours to 7 hours. I called AA on the occasion and was told it was "aircraft maintenance". I was very surprised they would term it as such as that puts it on AA to accommodate all those missed connections, and it would have been virtually every passenger on at least 2 of the flights. It also makes little sense since the aircraft overnights in DAY and PSA (AA commuter) has a maintenance hub in DAY.
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