London Heathrow Airport, the largest international airport in the UK, will remain closed until 11:59 PM on March 21, 2025, due to a significant power outage caused by a fire at a nearby electrical substation. This closure affects both passenger and cargo operations, with a substantial number of flights canceled, including 677 by British Airways. Freight companies are preparing for delays, and around 4,000 tonnes of cargo are stranded. Passengers are advised not to travel to the airport until it reopens, and updates will be provided as more information becomes available.

Source: https://www.stattimes.com/air-cargo/cargo-and-passenger-operations-hit-by-heathrow-shutdown-1354810