Participants fly their hot air balloons during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination. (Photos: VCG)

A participant prepares a hot air balloon during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination.

Participants prepare their hot air balloons during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination.

Participants fly their hot air balloons during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination.

Visitors watch hot air balloons during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination.

Visitors watch hot air balloons during the 22nd Stuckli Balloonfiesta in Sattel-Hochstuckli, Switzerland, Feb. 17, 2019. The festival held on Sunday attracted many hot air balloon lovers and visitors to Sattel-Hochstuckli, a famous tourist destination.