Looking through my records, I flew LGW-LED-LTN in Sept 1987 on G-BJCU & G-BAZG. It was a "Pearls of the Black Sea" two week Thomson tour routing Lenningrad-Moscow (Tu-134) Moscow-Oddessa (TU-154) Oddessa-Simferopol (AN-24) Simferopol-Sochi (TU-134) & Sochi-Lenningrad (IL-86) A very interesting trip and pretty good value as the Russian's wanted the hard currency! (most of the hotel food was pretty rough though!)
The return flight from Lenningrad to the UK was memorable as we had a massive headwind and had to divert to LTN due to issues with Gatwick night slots (as it was fairly late in the season) I didn't complain as it was a couple of miles to get home!