WPIX in NYC played it continuously and then within a day it was never broadcast again.
Yes. I recall that it was broadcast before there was any official narrative about what had happened to the airliner. There were many people standing on a patio near the beach and they all told the reporters on the tape that they had seen a missile shoot down an airliner.
SO.... even though the FBI took the original video, these networks that broadcast it would have had a COPY. Did the FBI go to all of them and force them to give up their COPIES ?