There was a Belgian passenger plan that got lost on its way to Teheran and had to land in Grozny. Before GPS planes had literal human navigators with maps and sextants!
I would be more inclined to believe in the Bermuda triangle myth if it happened with modern planes and their transponders.
IIRC some passenger aircraft had a sweet periscopic sextant installed, and even the 747 still had a sextant port - not that it stopped KAL-007 crossing the Kamchatka peninsula...
The British hid the Taj Mahal in WW2 from planes. In Indo-Pak war in 1971, cities and towns far from the border had to blackout. There was blackout in Punjab in 2025 war too.
Your comment reminded me about the concrete arrows deployed across the U.S. for pilots.
https://www.atlasobscura.com/articles/before-radios-pilots-n...
According to that, Montana still uses them.