No JAR there. Its a rating according to FAA regulations and an FAA checkride. Most probably you will find yourself doing a checkride with a JAR TRE as well. If you consider doing a 737 type in the States, i truly recommend an airline training center such as United (UAL services) or others. Unfortunately, our authorities have some sort of trauma with US type ratings and therefore you're best off doing it with somebody who's name is known (believe that United Airlines or Continental might sound more familiar than XY flight training at ZZZ). I am not saying that the training quality of others isn't that good - quite the opposite with places such as K&S and Highpower as they are led by some Southwest folks, but the names won't ring a bell with any authority here and therefore gives enough suspicion to start the usual type rating fuss again. You might be able to get credit for the entire training but you would still need an examiner. Either renting a sim here or bring the checker to the USA.
As for Pan Am, do a search on flightinfo.com and check the postings there.
Salve, vdive