You are an RAF ground crew technician at the start of the Battle of Britain, and the war depends on the planes you keep airworthy. From routine refueling to engine overhauls to gun harmonization, every task you perform on one of three meticulously recreated aircraft—the Supermarine Spitfire Mk.1, the De Havilland Tiger Moth, and the De Havilland Mosquito—matters. The campaign assigns you to a specific squadron with a specific pilot. Take care of him and he becomes an ace. Make mistakes, and he may not come back from his next mission.