What GlobalNav said (155, above).
Also, I had not meant to be understood as saying that anyone had advocated actually experimenting.
Time perhaps will tell whether a difference that appears to exist between the FCC and the FAA is a real difference. FAA obviously is situated within and as part of the Department of Transportation, headed by a Cabinet Secretary. The head of FCC might have "Cabinet rank" (I don't know) but it appears there's a difference in operating as a component (in so many words) of the president's Cabinet, and being instead one among many federal agencies which, collectively, sometimes are referred to as "the inter-agency." In this matter, it sometimes seems like the prior administration strongly favored commercial interests in telecommunications, and applied pressure on and through FCC. Then the new administrstion took over, FAA regained its role as the heavier of the heavyweights, and because Cabinet agencies can apply more authority more quickly, FAA was effective in changing the game up.
Tom Wheeler, formerly head of FCC, published a piece a few days ago in which he asked if FAA was like the kid who "cried wolf" once too often. Perhaps surprisingly, his writing appeared to give good amount of credence to FAA and the aviation community's concerns. But overall, this tangle-up doesn't bode well for future, anticipated clashes of rival technological interests.