Swiss International Air Lines (SWISS) says it has cancelled all flights from Geneva and Zurich to Heathrow Airport on Friday following a huge fire at a power sub-station which shut down London's main airport. +Get the most important news from Switzerland in your inbox The cancellation on Friday concerns a total of ten SWISS flights from Geneva with 944 passengers and 14 flights from Zurich with 1,969 passengers, the Lufthansa subsidiary said in a press release on Friday morning. "As a precautionary measure, all flights from Switzerland to and from London Heathrow have been closed to sales for Saturday 22 March," it added. The London airport operator, Heathrow Airport Holdings, said it expected "serious (traffic) disruption over the next few days" due to the fire. Ranked among the world's top five airports, Heathrow serves 80 countries and operates 1,300 take-offs and landings a day. It handles around 230,000 passengers a day. For its part, London's Gatwick Airport says it has begun ...