As a new annual citywide festival begins in November celebrating the city’s liberal character, James March explores how Berlin’s complicated past informs its unbridled present T rundling along Tempelhofer Airfield’s cartoonishly massive runway on my wobbly rented bicycle during a balmy August morning, I find it hard to visualise the remarkable events that took place here from 26 June 1948 to 30 September 1949. Trapped by a road blockade through East Germany, American and British air forces flew