A transatlantic cargo jet made an emergency landing at Shannon Airport on Friday after the crew reported smoke on board their aircraft. United Parcel Service (UPS) flight UPS-203 was en route from Philadelphia in the US to the German city of Cologne at the time. There were five crew members on board. The McDonnell Douglas MD-11 freighter was about an hour south west of Shannon when the crew attempted to alert air traffic controllers to the problem. Unable to reach controllers by radio, the pilot managed to relay their message to another UPS aircraft whose crew passed on the details to controllers at Shannon. A short time before the flight was due to land in Shannon the crew issued a Pan Pan radio call. A Pan call differs from a Mayday message as it signifies an urgency but with no immediate danger to those on board or the aircraft. The crew advised controllers that they had an issue with the aircraft's air conditioning system that resulted in smoke being visible in the aircraft. The crew also confirmed they were carrying 'some' hazardous materials and would also be making an overweight landing. As a precaution, the airport's fire service was placed on standby for the aircraft's arrival. The jet landed safely at 9.03pm and was pursued along the runway by airport fire vehicles so that firefighters could check that the jet's brakes didn't overheat or catch fire during the emergency landing. The aircraft was able to taxi to the terminal where fire crews carried out a further inspection of the jet while engineers were also waiting to investigate the issue. In 2015, a United Parcel Service MD-11 made an emergency landing at Shannon after the crew had to shut down one of the jets three engines over the Atlantic. The plane, also a McDonnell Douglas MD-11, had a crew of six on board and was travelling from Louisville, Kentucky in the US to Cologne in Germany. The crew reported a problem with of the jet's three engines and that they had to shut it down. For that incident, units of the local authority fire brigade from Shannon and Ennis along with ambulances and Gardai were alerted as part of airport emergency procedures after the crew reported they were carrying a variety of 'petroleum products.' The aircraft landed safely.