Originally Posted by schone

ToiletDuck is correct.

The FAA license, does conform to ICAO standards, therefore is an acceptable license with carriers requiring ICAO standards certified pilots (i.e Air China/CX etc etc).

The JAA, Joint Aviation Authorities, which are somewhat supervised or should I say conforms to the/by the British (UK) CAA (Civil Aviation Authorities) is a whole different set of rules to certify airmen.

To convert your licenses from an FAA to a JAA ones, you'll pretty much have to take the exams all over and the checkrides. There are a couple centres in the US which would be more than happy to help you with that for a certain "fee" ;-). Naples Air Centre in Florida is one of those places. You're pretty much looking at 14 (or maybe 16) written tests, and two or three checkrides. Namely COMM Group B I would assume (Comm ME airplane-land), and INSTR and probably an ALTP xride (our ATP... same deal pretty much.... harder written test).

If time is something you have alot of ahead of you, I would hold off on converting my FAA to JAA - as the European Union as a whole, is coming up with a new governing authority called the EASA. As of right now EASA is only concerned with certification of airplanes flying over the skies of EU member countries, but the plan is for EASA to take over all JAA responsibilities and to pretty much say goodbye to the JAA. So stay tuned, airmen certifications are coming up....

Hope this helps!
-schone