in Aireon. That sum is being paid through a series of installments ending in 2017 and will give Nav Canada a 51 per cent stake in the joint venture. The cross-linked Low Earth Orbit (LEO) satellites will, for the first time, make it possible to track aircraft from pole-to-pole, including oceanic airspace and remote regions, facilitating fuel savings, greenhouse gas emissions reduction, and enhanced safety and efficiency for airspace users. The added surveillance that Aireon will provide will enable air traffic control to significantly reduce the separation standard in oceanic and other unsurveilled airspace from approximately 80 nautical miles (nm) to 15 nms or less. This will allow more aircraft to fly at optimum altitudes and to benefit from the prevailing winds such as the jet stream, saving fuel and reducing greenhouse gas emissions. Aireon CEO Don Thoma estimates that this will result in an average fuel savings of $400 per flight for the three-and-a-half-hour trip across the North Atlantic. The annual fuel cost savings for airlines in the North Atlantic alone will be in the order of $125 million. In December 2013, ANSPs from three additional countries joined Nav Canada as partners in Aireon. Enav of Italy, the Irish Aviation Authority and Denmark's Naviair signed on for a combined investment of $120 million resulting in a new ownership structure for the company with Nav Canada holding 51 per cent, Iridium with 24.5 per cent, Enav at 12.5 per cent and the Irish Aviation Authority and Naviair each holding 6%. In September 2014 Aireon announced plans to offer ALERT (Aircraft Locating and Emergency Response Tracking), a free supplementary service for emergency tracking of aircraft in trouble. Aireon's ADS-B receivers on Iridium's satellites will already include ALERT's capabilities and the company has decided to make it available free of charge “as a public service.” Aireon ALERT could be activated by any certified air-safety organization to request the last known location and flight path of any aircraft carrying an ADS-B transponder, even if the operator does not subscribe to Aireon. Fleet Nav Canada operates a small fleet of aircraft. These aircraft are mainly used for flight inspection of navigation equipment and procedures. As of February 2023, Nav Canada had two Bombardier CL-600 registered with Transport Canada and operate as ICAO airline designator NVC, and telephony NAV CAN. Nav Canada previously operated two other Bombardier CL-600s and a Bombardier Dash-8 Series 100 for