Black Knights open Singapore Airshow

Two Singapore Armed Forces Black Knights fly past each other in close proximity during an aerial display on Tuesday Feb. 19, 2008, in Singapore during the first day of the Singapore Airshow, Asia's biggest aviation trade and business exhibition which highlights cutting-edge aviation technology from around the world. (AP Photo/Wong Maye-E)

Six Singapore Armed Forces F-16 Black Knights fly upside-down in formation during an aerial display on Tuesday Feb. 19, 2008, in Singapore during the first day of the Singapore Airshow, Asia's biggest aviation trade and business exhibition which highlights cutting-edge aviation technology from around the world. (AP Photo/Wong Maye-E)

The Singapore Armed Forces Black Knights fly in formation in their F-16s during the aerial display on Tuesday Feb. 19, 2008 in Singapore during the first day of the Singapore Airshow, Asia's biggest aviation trade and business exhibition which highlights cutting-edge aviation technology from around the world. (AP Photo/Wong Maye-E)

Spectators watch the Singapore Armed Forces Black Knights create a cupid heart with smoke trails from their F-16s during an aerial display on Tuesday Feb. 19, 2008, in Singapore during the first day of the Singapore Airshow, Asia's biggest aviation trade and business exhibition which highlights cutting-edge aviation technology from around the world. (AP Photo/Wong Maye-E)