South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





People watch as South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





Pilot Akmal Bin Abdul Kahar watches South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





South Korea's Black Eagles aerobatics team perform a manoeuvre during an aerial display at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





A Bombardier aircraft is displayed at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





U.S. Air Force Boeing P-8 Poseidon (R) is displayed at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





Indonesian airforce personnel stand next to their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. (Photo by Edgar Su/Reuters)





Indonesian airforce personnel tidy up their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. (Photo by Edgar Su/Reuters)





A visitor tours a Bombardier Global 6000 aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 16, 2016. (Photo by Edgar Su/Reuters)





Visitors walk past a Bombardier Global 6000 aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 16, 2016. Picture taken February 16, 2016. (Photo by Edgar Su/Reuters)





Visitors look at a Pratt and Whitney PW100 engine model at their booth at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)





A Qatar Airways Airbus A350 XWB aircraft is displayed at the Singapore Airshow at Changi Exhibition Center February 18, 2016. (Photo by Edgar Su/Reuters)