At least 1,350 flights to and from Heathrow were affected, flight tracking service FlightRadar 24 said, and the impact was likely to last several days.
Heathrow Airport reopened after an electrical fire caused a shutdown and the cancellation of over 1,350 flights. Air Canada is resuming flights to and from London, but passengers are advised to check their flight status. WestJet cancelled two flights, while Air Transat flights are unaffected. Toronto Pearson Airport cancelled all arriving flights from London. The fire's cause is unknown, and the disruption is expected to last several days.