Most aircraft in inverted acrobatic flight

According to Official Guinness Records,

The most aircrafts in an inverted acrobatic flight is 12 and was achieved by Esquadrão de Demonstração Aérea (Brazil), in Campo Fontenelle aerodrome, Pirassununga-SP, Brazil, on 29 October 2006.The Esquadrão de Demonstração Aérea (Air Demonstration Squadron) is part of the Brazilian Air Force and it is popularly known as Esquadrilha da Fumaça.During their record attempt was used 12 aircrafts of the model T-27 Tucano. They flew upside down in formation for 30 seconds above Campo Fontenelle aerodrome, Brazil.

For a complete list of 2006 records, please visit 2006 Guinness Records in Brazil.

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