sentences:  On 1 April 2008, a flypast by the Red Arrows over Central London marked the 90th Anniversary of the founding of the Royal Air Force.The milestone was also celebrated that June following Trooping the Colour 2008 with a flypast of 55 aircraft, and in July with a Royal Review and flypast of 90 aircraft at the Royal International Air Tattoo.Ten years later, the RAF's centenary was celebrated over The Mall, London and Buckingham Palace on 10 July 2018 with a large-scale flypast featuring the Red Arrows, the Battle of Britain Memorial Flight, and aircraft from several RAF squadrons.