London ( CNN ) -- August 13 is likely to be Heathrow Airport 's busiest day in its history , so the airport is building a temporary terminal to check through more than 10,000 athletes on that one day , the day after the closing ceremonies of the London 2012 Games . With 80 % of Olympic and Paralympic athletes , coaches , media and other visitors expected to use Heathrow during the games , the world 's busiest international airport unveiled the design of a temporary terminal to be used just for departures . `` The airport ... already operates close to capacity , '' said Nick Cole , the head of Heathrow 's Olympics planning team . `` Every part of the airport is working together to ensure we can give the athletes a warm welcome and ensure all passengers enjoy the atmosphere . '' London has had a relatively smooth seven years of planning and building venues . The one big worry for organizers and the city is transport . There are plans to limit car traffic while creating special Olympics-only traffic lanes . Officials have also asked companies to find ways to keep some employees out of central London and off the busy transport networks during July and August . In recent years , Heathrow has suffered from baggage snafus , snow disruptions and strikes . To help get people out of London after the games , Heathrow will allow athletes to check their luggage at the Olympic Village east of the city . Heathrow expects a 35 % increase in baggage on August 13 . Departure will not be the only challenge . The airport expects nearly 50 % more passengers arriving on July 26 , the day before the opening ceremony . That includes 390 athletes bringing in 780 firearms , says Heathrow .
The day after Summer Olympics 2012 is expected to be the busiest in Heathrow 's history . The airport estimates it will check through 10,000 athletes on that one day . To ease the congestion , it built a temporary terminal just for athletes . Heathrow will also allow athletes to check their passes at Olympic venues on that day .