Thousands of passengers had their flights cancelled or altered in mid-air after a massive fire ripped through an electricity substation near Heathrow, forcing the airport to close for more than 15 hours.
Up to 300,000 customers had been set to use Europe’s biggest airport on Friday, but 1,351 flights were disrupted by the blaze.
Despite initially saying it would be closed all day, Heathrow later announced some long-haul flights would restart during the evening. While the airport said it was once again fully operational the following day, at least of 100 of the roughly 600 flights which would typically have been expected on Saturday were cancelled.
The blaze which caused the power outage erupted at a high-voltage electricity substation in Hayes, five miles north of the airport, leaving around 67,000 households suffering power cuts.
Around 150 residents were forced to leave their homes and a 200-metre cordon was put in place around the substation, police said.
Here, The Independent takes a look at all we know about the fire and its effects.

What caused the fire?
A transformer at the substation caught fire, but it is not yet known what caused it.
One nearby resident described their room shaking and hearing a loud bang as the substation caught fire.
London Fire Brigade deputy commissioner Jonathan Smith said: “The fire involved a transformer comprising 25,000 litres of its cooling oil fully alight.
“This created a major hazard owing to the still live high-voltage equipment and the nature of an oil-fuelled fire.”

While counter-terror officers initially led the investigation, the Metropolitan Police later said it was not treating the incident as suspicious, but that inquiries were continuing and would now be led by the London Fire Brigade.
The fire brigade said its investigation would focus on electrical distribution equipment.
What is the economic effect?
Economist Stephen Rooney said: “In terms of what’s at stake, at the conservative end, we estimate a potential…
Click Here to Read the Full Original Article at The Independent Travel…