I'm arriving on NW632 from MEM on a Saturday evening, scheduled to arrive at 18:18pm. I will have at least 1 checked bag, more likely to be 2. I want to get on a flight to London the same night, the last BA flight leaving from JFK is at 22:30pm. Unfortunately it must be BA since I already have the ticket. I'll be in WT+ but I don't think JFK has dedicated check in desks. The NW ticket isn't really flexible either, unless I standby for an earlier flight.

My question is whether or not 4 hours is enough for the connection. A search suggests it is doable unless the flight to LGA is delayed a fair bit. Assuming it takes me an hour to get out of the airport at LGA, there's a Q33 at 19:15 arriving 19:45, then E train from Jackson Heights at 19:52 arriving 20:10, the AirTrain should get my to JFK by 20:30. Of course it could go horribly wrong... Is the shuttle bus between the airports likely to be faster than 1h15mins?

Hmm I think I've answered my own question and there is enough time to do it... Anyone thinks otherwise?