Portland General Electric Co., of Portland, OR, used to employ a very talented and fearless ex-military pilot back in the 1970s. He would fly up the Columbia and Willamette Rivers under the bridges.
Yeager used to do the same thing under the Charleston, WV bridges too.
Back in the day when he could just sign out an F-80 or F-86 for a weekend trip home.
Mr G’s cousin used to fly under the rim of the grand canyon. He had to quit because his commander was worried about power lines.