20. Your good friend the winemaker down in Chile has now released the very first vintage and reports his Cabernet Sauvignon is already drinking beautifully. In fact, his wine has already attracted the attention of the Wine Spectator magazine which is proclaiming the Maipo Valley in general and his Cab in particular as the Next Big Thing in the wine world! So a big party and celebration is in order at his winery and you are invited. Your current location is London in the UK and you've found a direct flight to Santiago which makes three (3) stops en route. But from which London airport? Well, you will need to include that with your answer along with the airline in question, all three stops and the equipment.

New to this very difficult game. This is the only one that I have a slight clue to the answer.
Which London airport? Gatwick
Airline? British Caledonian
Stops? Madrid, Rio de Janiero (of course, Galeao and not Santos Dumont, whose runway is barely long enough for a helicopter!), Viracopas/Campinas (GRU was not served by airlines in 1979 and Congohas runway was and is still too short)
Equipment? McDonald Douglas DC-10-30. Later, they did acquire DC-10-10 but I don't think it was in 1979 or earlier
Other comments? EVA Air was not around in 1979. They are the present BR. B. Cal., as it was sometimes abbreviated, was eventually acquired by British Airways. Only later was the UK second force (#2 airline) informally Virgin Atlantic.

Summary: BR LGW-MAD-GIG-VCP-SCL D10