Given the cost of some of the underwater search assets involved, it would seem to be less expensive to charter 2-4 777s with similar satcom installations, wait for an approximately similar moon phase, maneuver the necessary satellite(s) to a similar orbit, and fly the chartered jets along the most likely routes both north and south to generate results for comparison. Even with compensating Inmarsat for maneuvering fuel it would seem to be a more productive use of resources.