British Airways chief executive Sean Doyle has described the situation at Heathrow as "unprecedented" and said there will be a "huge impact" over the coming days.
The airline has been worst-hit by the shutdown – it’s responsible for 51% of flights affected.
Sky News requested an interview with British Airways to ask our own questions but they’ve provided this video statement instead.
Live updates: https://news.sky.com/story/large-fire-at-electrical-substation-in-west-london-causes-power-outages-13332920
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