Not really totally relevant as it was in a different city and pre-Covid, but we once had a great airline roundtrip offer available between Newark and Copenhagen. The return flight was scheduled at 9 AM. Both the cruise line (Princess) and our TA told us this was too early. We took the deal, but flew out the following morning heeding their advice. When the questionnaire for luggage tags was handed out, DW noticed that there was a tag for Continental flights at 9 AM. I then looked, and not only was she correct, but there was one for flights before 9 AM.