military controllers may also guide fighters in the so-called "cross-border areas" in France or Italy. So military airspace may also extend beyond national borders and be used by the air forces of the two countries concerned. Innovation Stripless: Since 2015, skyguide has adopted a harmonized stripless system at both its control centres (en-route & lower airspace sectors). The benefits here include increased heads-up time, shorter and safe handovers as well as providing voice traffic with additional digital support. Virtual Centre: In consolidating its air traffic control centres virtually (instead of physically, with all the latter's political, social and economic ramifications), skyguide is generating a new paradigm in air navigation services. The Virtual Centre model promises substantial benefits in terms of operational flexibility, business continuity and cost-effective technical evolution. Satellite-based navigation: The potential for further developing conventional navigation systems based on expensive terrestrial equipment is reaching its limits. So if flight procedures are to be further refined, new technologies are required. One such technology is satellite-based navigation, which offers more possibilities than conventional navigation systems and provides a promising foundation for innovative new approach and departure procedures. One of the key advantages of this new technology is the greater positional accuracy it provides. This in turn offers several further benefits, with the promise of more efficient air traffic handling, lower fuel consumption, fewer pollutant emissions and less noise, too. Solar Impulse: Skyguide actively supported the pioneering Solar Impulse venture in its round-the-world flight, providing air traffic services during test flights, aeronautical publications and a 24/7 helpdesk throughout both the voyage and the years leading up to it. Skyguide shares Solar Impulse's passion for a more sustainable aviation industry, and is proud to have served as a facilitator here. Locations Skyguide's main operating locations are its two operations centres, one next to Dübendorf Air Force Base in Wangen-Brüttisellen (near Zurich) and the other near Geneva Airport at Meyrin. The latter is also home to the company's administrative head office. The Wangen centre came into operation in February 2009. The centre is responsible for the airspace above German-speaking Switzerland, Lichtenstein, Western Austria and parts of Southern Germany. It is also home to the company's Aeronautical Information Services and to the Skyguide Training Center, which has two tower simulators and further facilities for the real-time training of air traffic controllers and other air navigation services personnel for both skyguide and foreign air navigation service