The participants stripped down to their underwear in a bid to draw attention to Irish airline Aer Lingus’ sale, which coincided with St Patrick's Day celebrations.
In keeping with the theme of the day, volunteers donned a green clover to help protect their modesty.
After meeting at a hotel on Albert Embarkment, stewards led the volunteers around London’s Jubilee Gardens, where they performed star jumps and did an impression of an airplane before lying down to sunbake.
Aer Lingus offered participants two free flights in return for their attendance.
The airline hoped to attract 999 volunteers, but it is thought that less than half that number took part.
An Aer Lingus spokesperson told the UK’s Sun that some revellers stripped off, despite police warnings.
"Once out of site of the cautious police, many of the participants ignored police warnings and stripped off for the bewildered, but eager, on-looking crowds, who captured the event on their camera phones,” the spokesperson said.
Aer Lingus launches routes to eight European destinations in April, from Gatwick Airport.