Once again, schedules are dynamic. The 2PM MCO-JFK flight (DL2019) does not operate from early May to early November because of reduced demand to Orlando. The November schedule begins on Nov 6th and that is when the flight is added, and the May schedule begins on May 7th and that is when that particular flight is removed from the schedule. MCO-LGA sees similar additions and reductions due to differing travel demand to Orlando based on seasons. There are still 5 other daily flights on MCO-JFK and 6x daily on MCO-LGA on/after May 7th.