Originally Posted by
KARFA
No, the bag drop for connections is post customs and landside, and you definitely need to go through security again regardless of whether you have a bag to drop or not - there is no airside sans-security connection route at JFK (or at any US airport I can think of) for an INT-DOM connection.
You can re-check your bags before you exit through the sliding doors after clearing immigration and customs. Then you need to go back upstairs and re-clear security.