Gas ballooning is the ultimate challenge for balloonists: they fly higher and farther than hot air balloons, often exposing pilots to violent weather conditions. Each year, the Balloon Fiesta hosts the America's Challenge Gas Balloon Race, which began in 1995. This competition, based entirely on the distance traveled by a balloon, is the premier gas ballooning event in the United States. Over the years, Albuquerque has hosted additional hot air balloon festivals including two gas balloon World Championships and two editions of the Coupe Aéronautique Gordon Bennett, the world's oldest and most prestigious gas balloon competition.