American Airlines flight 4270 made an emergency landing at Jacksonville International Airport Saturday. The plane took off at 5:31 p.m. from Miami and was diverted to JIA at 6:22 p.m. due to reports of smoke in the cockpit. The plane landed safely at 6:43 p.m. in Jacksonville with approximately 59 passengers onboard. Kasey Norton, a spokesman for American Airlines, said there was no smoke in the cockpit, but an odor was detected by the flight crew about one hour into the flight. Norton said maintenance crews checked it out and were unable to duplicate the issue. A cleaning of the oxygen system was done by crews and new oxygen cannisters were placed on the plane. A JIA representative said all passengers were deplaned and American Airlines began working on the issue. The plane was inspected by officials and everything appeared to be okay, according to a JIA representative. The representative for JIA said all passengers will reboard the aircraft and continue on to Pittsburgh; no specific takeoff time was given.