Heathrow's boss has said it was "frustrating" he slept through numerous emergency phone calls following a fire in March that led the airport's closure and the cancellation of 1,300 flights.
In his first media interview since a blaze at a nearby electrical substation disrupted flights for 270,000 passengers, Thomas Woldbye said it wasn't normally the way he acted.
"It's not how I normally operate but on an operational level all the right things happened," he told the BBC's Today programme.
Mr Woldbye admitted that the power outage would cost "millions" but declined to specify how much.
Results from Heathrow revealed that pre-tax profit fell by 37.2% to £203m in the first six months of 2025.
A review into the incident by former Transport Secretary Ruth Kelly found that Mr Woldbye missed two emergency notifications and "several" phone calls on the night of the fire and the subsequent power outage because his mobile phone had gone into "silent mode".
In the early hours of 21 March, Heathrow took the decision to stop operations at the airport. Mr Woldbye became aware of what had happened at around 6:45am.
He told the BBC he was satisfied with the crisis management procedures that were in place and went into action while he was sleeping.
"Of course, an organisation like ours has to be able to manage whether the captain's on the bridge or not and in this particular case we took the right decisions," he said.
An investigation into how the fire started at an electrical substation which supplied power to Heathrow discovered that it was the result of a known fault at the site.
National Grid, which owns the substation, had been aware of a problem since 2018 but failed to fix it.
As the results of the investigation were published, Heathrow said it was considering legal action against National Grid.
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