A flight tracker captured chaos ensuing in the skies after a huge fire at a west London electricity substation forced Heathrow Airport to close on March 21, 2025. The collapse of power supplies in Spain and Portugal in April led to the cancellation of around 500 flights. Yet when London Heathrow suffered a partial loss of power, nearly three times as many departures and arrivals were grounded. The airport’s chief executive, Thomas Woldbye, insisted the shutdown was the only possible response