Cirium Data – Heathrow Closure Today, 21 March (so far): The airport was scheduled to see 665 departures today, equating to over 145,094 seats A further 669 flights were due to arrive today, equating to 145,836 seats In total, therefore, the airport was due to see over 1,330 scheduled flights today, flying up 291,000 passengers British Airways has the largest share of flights from the airport (51%), followed by Virgin Atlantic and Lufthansa.