Have used the LTP in the past and only once have problem with the AirTran was out of commission after Sandy winds knocked it off the track. They supplemented it with buses. They have prerecorded messages that tell you when the next Tran is arriving and what stops it makes. You have to make sure you get on the correct tram since some don't stop at all terminals and also go off site. It is not staffed with any conductors but usually there are some AirTran staffers on the platforms, depending on the time of day, that can help make sure you are taking the correct Tran. Also you can ask fellow riders on the platform that can help as well and there always seem to be a lot JFK employees that use the Tran. Make sure you add some time into your schedule for taking the Tram as well, since your not getting dropped off directly at the terminal.