Police blimps were used to patrol the sky during the 2004 Republican National Convention, the 1996 Atlanta Olympic Games and the 2004 Athens Olympic Games. The blimp "Santos-Dumont", named for Alberto Santos-Dumont, operates in the Caribbean for the Special Anti-Crime Unit of Trinidad &amp; Tobago (SAUTT), providing security surveillance. During April 2009, this blimp provided aerial surveillance of the 5th Summit of the Americas in Port-of-Spain. Greater Manchester Police began trial operations of a blimp in 2010 to provide surveillance for major events, which would be a cheaper alternative to the use of a helicopter in the long term. However, the blimp was only used on 18 occasions because of weather-related operational problems.