Aircraft technicians make adjustments to the propeller of a Hurricane MkII aircraft at the Battle of Britain Memorial Flight Centre at RAF Coningsby on Feb. 9 in Coningsby, England. The Hurricane at the base is believed to be the last to enter service in the RAF in 1944. Planes at the base are currently undergoing their annual service in preperation for this years 70th anniversary Battle of Britain Celebrations at RAF Fairford. ( Dan Kitwood/Getty Images)

CONINGSBY, ENGLAND - FEBRUARY 09: Aircraft technician Edward Cash works in the nose bay of a Lancaster Bomber at the 'Battle of Britain Memorial Flight' centre at RAF Coningsby on February 9, 2010 in Coningsby, England. The Lancaster PA474 was built in 1945, and is one of only two operational aircarft ramianing of the 7377 that were built. Planes at the base are currently undergoing their annual service in preperation for this years 70th anniversary Battle of Britain Celebrations at the Royal International Air Tattoo at RAF Fairford. (Photo by Dan Kitwood/Getty Images)

Aircraft technician Edward Cash works in the nose bay of a Lancaster Bomber at the 'Battle of Britain Memorial Flight' centre at RAF Coningsby on Feb. 9 in Coningsby, England. The Lancaster PA474 was built in 1945, and is one of only two operational aircarft ramianing of the 7377 that were built. Planes at the base are currently undergoing their annual service in preperation for this years 70th anniversary Battle of Britain Celebrations at the Royal International Air Tattoo at RAF Fairford. ( Dan Kitwood/Getty Images)