[SINGAPORE] Most flights operating between Singapore and London’s Heathrow Airport resumed on Mar 22, following a significant power outage that shut down the British capital’s main airport, leaving thousands of passengers and planes stranded.

According to data from flight analytics firm Cirium, three out of four Heathrow-bound flights operated by Singapore Airlines (SIA) and scheduled to depart from Changi Airport on Mar 22 will proceed as planned.

While Flight SQ306, scheduled to depart at 1.10 am, was cancelled, SQ308, which was set to leave at 9 am, and SQ318, scheduled for 12.45 pm, departed from Changi as planned. Flight SQ322 is scheduled to leave at 11.45 pm.

Meanwhile, two Singapore-bound SIA flights from Heathrow on Mar 22 have been cancelled, while two others are set to depart as scheduled, according to Cirium’s data.

A fire at a nearby substation knocked out power at the world’s fifth-busiest airport, with flights resuming hours later on Mar 21 (Mar 22 morning Singapore time). The incident has reportedly prompted aviation experts and airlines to question how such critical infrastructure could fail.

Two SIA flights that left Singapore for Heathrow on Mar 20 and 21 were diverted – one to Frankfurt, Germany, and the other to Paris, France – while four scheduled for departure on Mar 21 and 22 were cancelled. Four Singapore-bound flights from Heathrow on Mar 21 were also cancelled.