Caveman, you are dead wrong. If JB management thought they had the proper approval, then they have shown themselves to be incompetents.
The duty time regulations are verbatim from the FAR's, and are thus FEDERAL LAW. They can only be changed by Congress, or by the appropriate agency, at the highest level, after a specific administrative or judicial procedure (see the NPRM reference in an earlier post). This is true for ALL Federal agencies, not just the FAA.
If the pilots flew past those limits, then they and JB violated FAR's, period. The local FSDO, or even some department in FAA HQ has no authority to change FAR's. They may sometimes interpret a grey area of the FAR's, and they often create rules within parameters laid out by the FAR's, but they can't just go and change the source document. I'm not sure where the JB legal department was on this one, but management should have known (especially flight ops management). I am not stating my opinion on the validity of the study (though I have one), only on how JB thinks they can do what they want. They deserve this article. The management I mean, not the many good bros I know who fly for JB.