N624US (cn 21706) Loading up for a Brown's charter to Oakland California, this 747 has since been retired from the Northwest (Delta) fleet and was put into storage at Marana. Recently, the aircraft was purchased by Kalitta and ferried on August 31, 2010 to their maintenance base in Oscoda Michigan. I don't know if they are going to revive it as a freighter or are using it for spares.