Colorful hot air balloons filled the northern Austrian sky early on Monday morning near Gross-Siegharts, Austria. /VCG Photo

Competitors will showcase their flying speed and navigational precision during the 23rd FAI World Hot Air Balloon Championship 2018. /VCG Photo

Around 100 teams from more than 38 countries are taking part in the biennial event. /VCG Photo

Each flight is scheduled for morning or night when light winds usually allow for safer takeoffs and landings. /VCG Photo