This is no different than the FED who takes the jumpseat for a "line check" during the peak travel seasons so that he can go visit his family in another state. Bumps all other jumpseaters. Guaranteed travel. Except this doesn't cost the airline revenue, it just bumps legitimate jumpseaters from getting to work.
121.581 Observer's seat: En route inspections.
(a) Except as provided in paragraph (c) of this section, each certificate holder shall make available a seat on the flight deck of each airplane, used by it in air commerce, for occupancy by the Administrator while conducting en route inspections. The location and equipment of the seat, with respect to its suitability for use in conducting en route inspections, is determined by the Administrator.
Sounds legitimate to me......