Schedule: the flights that flew on Thursday, Oct 22, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
Yesterday
UA 1663 · IAH → PHL
departs 6:05 PM CT · arrives 10:29 PM ET
UA 1663 isn’t flying IAH → PHL on Thu, Oct 29
This listing came from a typical schedule. According to the FAA, UA 1663 flies these legs that day: