For John Walton, it was just another day in his job as an airport worker at Heathrow. But then suddenly, while he was working on an aircraft near the taxiway, his heart stopped. When he collapsed, his colleagues at United Airlines rushed to his aid.

The United Kingdom’s busiest airline hub says that Santa will be far from the only person taking to its airspace this Christmas. London’s Heathrow Airport says that it is expecting to serve a record number of passengers on 25.