✈️  A fire at London’s Heathrow airport knocked out its power supply and shut Europe’s busiest airport for the day, stranding thousands of passengers and causing travel turmoil worldwide.   The skies were noticeably less busy than usual, with operations partially resuming Friday evening and later expected to return fully on Saturday.   Tristan Werkmeister explains the costly impact of the domino effect on flights.   #London #Heathrow #airport #planes #travel #fire #LHR