It really depends on the airport. At JFK I recently arrived in Terminal 2 on DL and had to transfer to an AF flight departing Terminal 1. I took the bus from Terminal 4 to Terminal 2, exited the airside and then had to re-clear security at Terminal 1 (a bit of an irritating experience given that there are limited TSA pre-check options at T1). My two hour connection time was whittled down to 30 minutes after the TSA line at T1.
No. The only way to get from one terminal to another is to exit the terminal and take the air train or a shuttle bus.
A possible exception to this is for Delta, which operates in Terminals 2 and 4. They apparently have a bus that connects the airside areas of these terminals. See the map here: http://www.delta.com/content/www/en_US/traveling-with-us/airports-and-aircraft/airports/new-york-jfk.html
Indications are that this bus will disappear at some point, presumably when construction of a direct link between the two areas has been completed.
Credit:stackoverflow.com‘
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