A record number of passengers are expected to pass through Heathrow today as Olympic athletes start to arrive in London.
More than 236,000 passengers are expected to travel through the airport on, breaking the previous record of 233,562, set on July 31 last year.
Olympians from more than 50 countries will arrive in London, with extra staff and volunteers on duty to help keep waiting times for passengers to a minimum, according to airport company BAA.
Nick Cole, head of Olympic and Paralympic planning at BAA, said: "Today heralds the start of Britain’s biggest peacetime transport challenge and Heathrow’s busiest ever period.
"We are expecting more passengers to travel through Heathrow today than on any day in the airport’s history.
"We have spent seven years preparing for the Games’ challenge.
"Now we are putting that planning into action with thousands of extra staff and volunteers on hand to welcome the world to London."
And he said the airport faced more challenges when the Games end, with athletes and staff departing on August 13.
"The Olympic and Paralympic Games are a marathon, not a sprint, for Heathrow," said Mr Cole.
"The airport has some major challenges ahead, including unprecedented numbers of departing Olympics passengers and bags on August 13 and Paralympic arrivals and departures in August and September."
Facts and figures
Passengers: 236,955 passengers (121,239 arrivals and 115,716 departures) are expected to pass through the airport today compared to 190,000 on an average day.
Athletes: 335 athletes are expected today as part of 1,027 Games family arrivals. The busiest day for arriving athletes is expected to be 24 July when 1,262 athletes and coaches are expected as part of 3,008 Games Family arrivals.
Volunteers: More than 500 Heathrow and Locog volunteers, speaking more than 20 languages between them, will welcome groups of Olympic athletes and officials from their planes today.
Olympic accreditation: London 2012 accreditation desks are operational in each terminal allowing Games family members to collect their accreditation for the Olympic Village as soon as they arrive.
Immigration: Additional Border Force officers are staffing immigration desks for the peak arrivals period, helping to ensure that all passengers have a smooth journey.
Border waiting times have been within the targets set by the Home Office, which is responsible for immigration, since new resources were put in place yesterday.
Baggage: Additional staff are on duty in the baggage hall to quickly reunite Olympic teams with their baggage and equipment.
Athletes travel with around twice the number of bags as regular passengers (an average of nearly three items per athlete).
Approximately 15% of baggage on peak days will be large pieces of sporting equipment such as canoes, pole vaults, bikes and javelins and around 1,000 guns and associated ammunition will be arriving with competitors over the coming days.
Onward travel: London 2012 coaches will be operating from airport forecourts for the first time today to transport athletes to the Olympic Village.
Accredited media will be using the Heathrow Express as the quickest and most convenient way to access central London.
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