I always thought that the UK CAA (and now JAR) had more severe and limiting flight and duty limitations compared to the FAA 121 regulations. Well, the only JAR limitation more restrictive than the FAA is the 900 hours yearly flight time limit, compared to the 1000 hours with the FAA. I believe that JAR is more lenient in flight time/duty time limitations for daily, and weekly limits than the FAA. I have heard about two/three pilot crews operating round trip flights from Europe to North America and Carribean, under JAR.... Illegal with FAA rules.
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I certainly agree that the FAA should stop air carriers for abusive "interpretation" of their rules, because of certain circumstances. One I recall in the USA was the "tail-end ferries" under FAR 91. Have they done anything about that...?
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Happy contrails