South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. The Airshow will take place from February 16-21. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





An Airbus A350 flies past during a preview aerial display of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a maneuver during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





Photographers take photos during a preview of the aerial display of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





A Republic of Singapore Air Force (RSAF) F-15SG fighter aircraft performs a maneuver as it flies past an RSAF AH-64D Apache helicopter during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





A Republic of Singapore Air Force (RSAF) F-15SG fighter aircraft performs a maneuver as it flies past an RSAF AH-64D Apache helicopter during a preview of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





A worker cleans model aircrafts on display at the Singapore Technology (ST) Engineering booth during a preview tour of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)





An Airbus A350 flies past during a preview aerial display of the Singapore Airshow at Changi exhibition center in Singapore February 14, 2016. (Photo by Edgar Su/Reuters)