Joe Sutter (C), former Boeing engineer who led the team that designed the original Boeing 747, watches the delivery ceremony held in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

Song Zhiyong (R), president of Air China, and John Wojick (C), senior vice president of global sales and marketing for Boeing Commercial Airplanes, greet Joe Sutter (L), former Boeing engineer who led the team that designed the original Boeing 747, before the delivery ceremony held in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

A worker looks at a Boeing 747-8 Intercontinental airplane to be delivered to Air China in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

A Boeing 747-8 Intercontinental airplane to be delivered to Air China is seen in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

Pilots of Air China, He Xiaohu, Zhang Xiao, Zhang Hengwen, Chen Guosheng and Zhou Zaiming (from L to R) pose for photos before a delivery ceremony in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

A worker walks near a Boeing 747-8 Intercontinental airplane to be delivered to Air China in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)

A Boeing 747-8 Intercontinental airplane to be delivered to Air China is seen during a delivery ceremony in Seattle, the United States, on Sept. 29, 2014. A delivery ceremony for the first Boeing 747-8 Intercontinental airplane to be delivered to Air China is held in Seattle on Monday. (Xinhua/Zhang Yuwei)