Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of Canadian Harvard Aerobatic Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of Canadian Harvard Aerobatic Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

A CF-18 Hornet with the logo of 150th anniversary of the founding of Canada performs during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)

Aerobatics aircrafts of the Canadian Air Force Snowbirds Team perform during the 68th Canadian International Air Show in Toronto, Canada, Sept. 2, 2017. The 68th Canadian International Air Show kicked off here on Saturday to soar over Lake Ontario for Labour Day long weekend. (Xinhua/Zou Zheng)