LGA is only 8 miles away from Midtown, and it was a 30 min ride this morning there are 7:15 AM. EWR is more suited to New Jersey citizens, and CO has a fortress there, so Delta might not try. Plus, they use the 738 and 757 there. JFK is a 50 minute SUBWAY RIDE (no traffic!) from Midtown, so it is closer to Long Island than Midtown.