Well it looks like the mystery will remain, but never mind, many thanks to all contributors.
It has however served to remind me of a dodgy flight I once took myself, a domestic flight with Aeroflot early 90s, of which I'm sure there must be a few scare stories. The Tu-134 tasked to take me from St. Petersburg up to Arkhangelsk proved to have no interior cabin lining in the forward third of the fuselage and I felt like I could have poked my finger right through the skin!
To add to the spectacle, in those days they still did separate boarding for Johnny Foreigners, and so yours trully and a Turkish businessman found ourselves escorted to adjacent seats over the wing. Of course as soon as the local plebs were allowed on board we saw that the flight was quiet and took a row each.
Upon climb out, I happened to be looking out the window to the rear and jumped in my seat as another aircraft on approach descended down over the top of us, with not many feet separation! I'll never know if he had seen us or not.
Those were the days 😬
Cooch