The competition in this market is certainly getting tougher.

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On Tuesday, Air China Ltd finished the upgrading of its fleet to all US destinations, and it will now use more advanced Boeing 777-300ER aircraft.

Hainan Airlines Co Ltd also plans to put its entire Boeing 787 Dreamliner fleet onto its North American routes this year. The 213-seat Dreamliner is the newest passenger aircraft in the world.

AA is also using its new fleet as an advantage to compete with other players in the market. The carrier has 567 aircraft on order, and it will use Boeing 777 family aircraft on its two new China-US routes.

Strong profitability is prompting carriers to invest in the market, experts said.

"The China-US route is the most profitable route in the world, which is attractive for the carriers, especially when business is weak in other markets," said Li Xiaojin, a professor at the China Aviation University

US-based airlines have a 35 percent share in the market, and Chinese airlines have 25 percent, Li said.

More pictures:

Shining models at 15th Aviation Expo China	Private jet dealer exhibits aircraft models