There is a joint user exam center for JAA ATPL exams in association with the UK CAA in Lake Mary, Orlando Florida.
This is a facility that is set up and paid for by three schools only, they are:
Helicopter Adventures
http://heli.com
Delta Connection Academy/ Altantic Flight Training
http://www.deltaconnectionacademy.com
Naples Air Center
http://nacgroundschool.com
There is a fee to use this center as the above schools are paying for independant invigilators, the conference room where the exams are held, and also the cost of the CAA to certify this exam center. The exams are held once a month, just the same as the UK exams, and to the same timetable.
Contact any of the three schools above for booking and costs.