Asking on behalf of friends who are intending to fly into JFK on SQ26 on Apr 24 (ETA 1110 - presumably arriving T4?). They have visa waiver for the US, but neither of them have been to the US before, so I'm assuming that they can't use the immigration kiosk on arrival.
They have plans to fly to MCO from JFK after arrival (separate tickets) and they will have check in baggage.

Is it feasible for them to make it to either AA2704 (ETD 1550) or DL572 (ETD 1558)? Or is it safer to go with B6 883 (ETD 1638)?
Are transfer counters available after baggage collection/customs so that they can recheck the bags immediately? Or would they need to drag their bags on the AirTrain to the appropriate onward terminal and check the bags in there?

I haven't personally done an immediate transfer at JFK before, so I'm hoping some of you would be able to offer some advice re: this! Thanks!