Here are the departing flights listed as delayed and cancelled on the airport departure board.
Delayed
American Airlines AA731 at 9.15am to Charlotte
American Airlines AA729 at 9.35am to Philadelphia
Virgin Atlantic VS302 at 10.30am to Delhi
British Airways BA938 at 11.10am to Dusseldorf
British Airways BA1412 at 11.35 to Belfast
United Airlines UA017 at 12 pm to New York City
American Airlines AA733 at 12.15pm to Charlotte
British Airways BA193 at 1.05pm to Dallas Fort Worth
British Airways BA197 at 2.50pm to Houston
British Airways BA566 at 3pm to Milan
American Airlines AA735 at 3.15pm to Charlotte
British Airways BA870 at 9.15pm to Budapest
Cancelled
British Airways BA306 at 8.40am to Paris
Virgin Atlantic VS005 at 11.15am to Miami