Originally Posted by RichardInSF
I see no way you can guarantee you will even have the 15 minute transfer time if you are arriving on an international flight, as there is no way to gauge in advance how long it will take you to get through immigration -- it can take up to an hour although I think it has improved somewhat lately.
This is the key. How much time have you allowed between your aircrafts scheduled arrival and the NEX you are planning to take?