When President Bush took office in January 2001, the White House was told that Predator drones had recently spotted Osama bin Laden as many as three times and officials were urged to arm the unmanned planes with missiles to kill the al Qaeda leader. But the administration failed to get drones back into the Afghan skies until after the Sept. 11 attacks later that year, current and former U.S. officials say. Top administration officials discussed the mission to kill bin Laden as late as one week before the suicide attacks on New York and Washington, but they had not yet...