@Jamie2k9
If the Boston flights is departing at 14:10 you will clear immigration. If it's departing at 11:00 you will not clear immigration.
How come the early one doesn't have clearance and the later one does? It doesn't seem to make sense when the USCBP officials are on duty from earlier in the morning with DL and CO departures not to mention their own 105 to JFK which only departs 30 minutes before hand. I'm shocked and disappointed that EI are not using the facility to its full potential.