"It is ironic that the FAA be paid by congress study a USCG system, LORAN, for aviation;"
Not so odd if you know the genesis of it. In the 1980's USCG SAR aircraft were using civilian LORANs bought in the boating stores, simply strapping them into the cockpit and going because the equipmen WORKED.
Mind you, some of these aircraft were WW2 vintage and the electronics on them was barely newer, the USCG got the scraps one step ahead of the boneyard.
So now you have pilots, trained SAR pilots, who got used to using LORAN when then was no VOR on the target. They started to expect the same boxes in other applications, and demand grew from the bottom up--from the users--not from some pie in the sky request from some agency to Congress. The FAA has only been following, the tail of the dog.