A Swift Air Boeing 737-400, registration N801TJ performing flight Q7-5017 from Saint Louis Downtown,MO [KCPS] to Los Angeles,CA (USA), was climbing out of St. Louis Downtown Airport when the crew stopped the climb at about 5000 feet reporting smoke in the cockpit and returned to the Downtown Airport for a safe landing about 9 minutes after departure. Emergency services did not find any trace of fire. A replacement Boeing 737-300 registration N531AU reached Los Angeles with a delay of 4 hours. The aircraft was carrying the ice hockey team of the Dallas Stars for their match against the Los Angeles Kings. The Dallas Stars reported there was visible smoke in the cockpit possibly as a result of an electrical malfunction.