Trains linking Paddington Station with Heathrow’s Terminal 5 may be canceled or face delays of up to 30 minutes.

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Heathrow’s chief executive has defended the airport’s response to the power outage and shutdown that sparked global travel chaos, apologizing to stranded passengers and confirming the airport is “operating as normal” Saturday.

A fire at a substation in London cut off power to one of the world’s busiest airports, causing travel disruptions globally. But some flights resumed Friday evening.

London's Heathrow Airport reopened on Saturday after a power outage at one of the world's busiest airports the previous day caused widespread chaos and cancellations.

After being closed due to a power outage, London's Heathrow Airport said it would begin to resume flights Friday night.

A fire at a nearby substation knocked out the airport's power. At least 1,350 flights were affected, FlightRadar 24 said, and the impact was likely to last several days.

London's Heathrow Airport says it plans to resume some flights later Friday and hopes to return to a full schedule on Saturday.