So I landed at the A terminal gates the other day and I thought I would take the shuttle to the B gates. WRONG!! It turns out that the A gates are not connected airside either in this stupid airport, how ridiculous is that, lol...So, pretty much in most cases you have to exit terminal, take airtrain to your second terminal, and re-clear security again (or just exit and re-clear security, if on the same terminal). This airport takes the cake for stupidity.
Also, no TSA pre but priority security lanes for J flyers. If you are on a tight schedule, make sure you fly J, otherwise you will be in a very long security line....