For exemption 3585, it was originally applied for by Peoples Express. Now, 3585 is applied for by the Air Transport Association on behalf of its member carriers, hence its the same 3585 whether you're at Mesaba, Mesa, or Delta. Each carrier, however, can apply their own more restrictive rules to 3585; when I dispatched at AWE, for example, we didnt apply 3585 to high minimums captains at all (a rule I agreed with).
The 1-1-2 exemptions are applied for by the individual carriers, and each letter from the FAA authorizing it are slightly different, owing to the different ways each airline can do it, and their own internal dispatch processes...
DS