Hot air balloons take part in the 38th International Balloon Festival of Chateau-d'oex, Switzerland, 23 January 2016. The festival takes place from 23 to 31 January. (Photo by Cyril Zingaro/EPA)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. For nine days balloonists from 15 countries take part in the ballooning event in the Swiss mountain resort famous for ideal flight conditions due to an exceptional microclimate. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Balloonists prepare to take off during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Balloons fly during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Balloonists prepare to take off during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A man walks between inflated balloons during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A participant prepares a balloon for inflation during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Participants deflate their balloon after a flight during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Balloonists prepare to take off during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





Balloons fly during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)





A balloon flies during the 38th International Hot Air Balloon Week in Chateau-d'Oex, Switzerland January 23, 2016. (Photo by Denis Balibouse/Reuters)