Warren Hu, a college student from New York, was one of thousands of passengers affected by the closure of Heathrow Airport on Friday. The closure was caused by a fire at an electrical substation near the airport, which resulted in a power outage. Heathrow, one of the world’s busiest airports, had to shut down all operations for the day, with warnings that flight disruptions could persist for several days. Passengers from various locations, including Vietnam, Brunei, and India, were scheduled to land in London, while others were set to depart for destinations such as Tokyo, Singapore, Minneapolis, and Miami. In Shenzhen, China, Lukas Zou, a trader, was left waiting for updates on his delayed flight to London. With significant luggage and a non-refundable hotel booking in London, Mr. Zou expressed uncertainty about the situation. Shenzhen Airlines was arranging accommodations for affected passengers and rescheduling the flight for 2 a.m. — news from The New York Times