sentences:  In April 2009, the carrier began cargo flights from Ypsilanti, Michigan to Bagram Air Force Base in Afghanistan; the flights were extended to Kandahar International Airport in August of that year.This service was discontinued in 2010, with the last working flight for the DC-8 with National taking place in May 2012.During the summer of 2010, the airline purchased three Boeing 747-400BCF aircraft.