I use the airporter between JFK-LGA and vice versa. If you buy a book of 20 coupons it works out to $9 a ride (instead of $14 per one time). Often very late leaving JFK in morning. They advertise terminal 5 at 5am on the first run; however, it's more like 5:20. Plus they make multiple stops. If you have time it's a cheap, clean, and reasonably pleasant option.