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Heathrow Airport delays will cost airlines millions. They got lucky this time.

Heathrow Airport shut down due to a fire, disrupting flights for most of the day.

The shutdown affected thousands of passengers and likely cost airlines millions in lost revenue.

Airlines could lose $80 to $100 million rerouting passengers and any accommodation.

London Heathrow Airport closed on Friday due to a power outage, crippling flights into the region for the better part of a day. The fallout will cost airlines a pretty penny — but the timing could have been much worse.

Thousands of passengers expecting to be in London spent hours in the air only to end up back in places like Tokyo, Mumbai, and Dallas. Australia's flag carrier Qantas said its passengers who were diverted to Paris would be transported to London via bus, a nine-hour journey.

Heathrow said it would re-start flights late Friday, meaning some travelers could get back on track sooner than expected. But reorganizing an airline network is no easy task when diversions and cancellations leave planes and crew in unexpected places.

Luckily for Heathrow and the airlines that call it home, especially British Airways, the power outage was fixed in less than a day and did not occur during a crowded travel time, like the summer holidays.

Over the years, natural disasters and infrastructure problems have grounded airline and