Airplanes are on this just before they land

Based on the clue 'lagos ibadan ogbomosho are the largest cities of this west african nation', what is the answer? What is associated with: four years after gold was found at his mill on january 24 1848 he was bankrupt? Bateman Island, about 300 miles from the Pacific, was the farthest Lewis & Clark traveled upstream on this river Deion Sanders knows this term for the evening hours when the largest audience is available for TV Girls' No. 7: de Havilland, Newton-John (I really can't think of another Newton-John, can you?) Tom Drake in Words and Music (Hint: Mickey Rooney played his partner Lorenz Hart) D.O. can stand for doctor of this, using manipulative therapy as well as conventional medicine In Edward Lear's poem, The Owl and the Pussycat head to sea in this colorful transport