A major problem in defending the Swiss airspace is the size of the country. The Swiss maximum extension is only . Commercial airliners may pass over in about 15–20 minutes, while fast jets would take even less time. However, noise-abatement issues traditionally caused problems for the Swiss Air Force because of the tourist industry. Due to these reasons, the Swiss Air Force is increasingly participating in air defence training exercises with many NATO counterparts. These exercises have covered the 2006 Winter Olympics in Turin, the Euro 2008 football championships, and the annual World Economic Forum.