Baku, March 22, AZERTAC At 04:45 this morning, the first planes of the morning began to arrive at Heathrow after the chaos of yesterday - however a hangover remains, BBC News reports. Of the first 20 flights of the day, nine were cancelled. They were meant to have been arriving from all over the world - Singapore, Doha, New York, Nairobi and Lagos were just a few of the departure cities. Heathrow is aiming for "full operation" today, chief Thomas Woldbye has said - though British Airways estimated 85% of its planned flights would run, but with delays throughout. It's been 24 hours since emergency crews were called to a fire at a substation in west London, which led to the complete closure of Heathrow Airport.