Thanks for your input.
I had already considered AirTrain and, if it were only me, it would be my first choice for sure, because I like trains and I would like to try this new one that didn't run when I was last there in Sep'02. Besides, it is cheaper (5$ AirTrain + 1,5$ Subway).
My two concerns are:
- one of my companions is not too keen of travelling by subway with luggage (but, maybe, can be convinced)
- we should take AirTrain to Jamaica, then line E up to Lexington Av/53rd, then transfer to the green line (6, I think) until 33rd street, and then walk three blocks until 31st at Lexington, our final destination. Anyone knows if the E/6 transfer is easy carrying luggage (i.e., escalators available, short corridors,...)?