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12 August 2012, 07:14 | Updated: 13 August 2012, 11:49
Almost 200,000 people a day are set to leave London after the Olympic Games end.
116,000 passengers will travel from Heathrow terminals on Monday, while upto 70,000 are expected to pass through Gatwick each day this week.
A special Games Terminal has been set up at Heathrow to help the athletes travel out, it's decked out like a typical London park, 5000 are expected to fly on Monday.
Volunteers will form a guard of honour to cheer the athletes into each terminal.
There is also be a new departures process, including a check-in and bag drop at the Olympic village.
Colin Matthews, chief executive of operator BAA, said: "Olympic departures present a fresh challenge with new facilities like the Games Terminal being used for the first time.
"We have been preparing for seven years to deliver a farewell of which the whole country can be proud."
Some of the challenges they face are the number and size of the athletes' bags.