Air China and United Airlines have signed a multi-year agreement to strengthen their long-standing strategic partnership.
Air China and United will work together to elevate their product offering to customers, from connecting flight opportunities to creating a more seamless experience for customers when traveling through key gateway airports such as Beijing and San Francisco.
Expanding joint marketing and product-enhancement opportunities are also on the cards.
Air China's president, Song Zhiyong, said both the US and China were crucial for the international aviation market.
"I firmly believe that the strengthened partnership between United and Air China will provide better and more convenient services for the passengers in the joint Sino-U.S. market."
The partnership first started in 2003 and United's president and chief executive officer Oscar Munoz said it had made a positive difference in the travel experience for both carriers.