Space shuttle Discovery ready for voyage to museum

CAPE CANAVERAL, Fla. — Space shut­tle Dis­cov­ery has one last mis­sion to com­plete. At day­break Tues­day, the old­est of NASA’s retired shut­tle fleet will leave its home at Kennedy Space Cen­ter for the final time, rid­ing on top a mod­i­fied jumbo jet.