instructors and other seasonal workers due to the size of the three valleys area. Courchevel's couloirs are considered some of the most difficult black runs in the world. Courchevel's sister city is Park City, Utah in the United States, and it has a red-graded ski piste named "Park City". Airport Courchevel's airport has a very short and steeply sloped runway, with a length of and a gradient of 18.5%. The airport has a dangerous approach through deep valleys, which can only be performed by specially certified pilots. On landing there is no go-around procedure, as most of the world's airports have; there is merely a very steep hill which has seen a few accidents since the airport first opened. Larger propeller aircraft such as the Twin Otter and Dash 7 (carrying up to 50 people) have been regular users of the airport over the years, but have since been phased out of use and smaller Cessnas and helicopters are now the main users. The History Channel program Most Extreme Airports, ranks it as the 7th most dangerous airport in the world. Sister cities Park City, United States Dabussy, France References External links Official site of Courchevel Tourism Office Official site of Les 3 Vallees Cycling up to Courchevel-Altiport: data, profile, map, photos and description Ski stations in France Sports venues in Savoie Tourist attractions in Savoie