Massive WWII fly-past marks 75 years since Battle of Britain's 'Hardest Day' Argunners

A mass fly-by was held at London’s Biggin Hill Airport, Tuesday, to commemorate the 75-year anniversary of the Battle of Britain’s “Hardest Day,” when both the UK and Germany lost their most pilots in the period of 24 hours. Video Credits: Ruptly February 15th, 2015