A Boeing 757 jet operated by Delta Air Lines lost a nose wheel while preparing for takeoff from Atlanta, potentially creating more uncertainty around one of the nation’s top manufacturers after a troubling string of incidents involving its planes. Delta Flight 982 – headed to Bogota, Colombia – was taxiing for departure at Hartsfield-Jackson Atlanta International Airport when the incident took place around 11:15 a.m. on Saturday, according to the Federal Aviation Administration, which is investigating the incident.