CHICAGO -- Boeing says Aeromexico plans to buy up to 100 planes worth more than $10 billion.

A joint statement from Boeing and the Mexican airline says that Aeromexico plans to buy 90 of Boeing's new 737 Max jets. That's a new version of the 737 that is getting a new engine and other tweaks to improve fuel efficiency. Aeromexico also plans to buy 10 of Boeing's new 787s, a medium-sized plane generally used on international flights.

The deal is not yet a firm order.

The airline says the new planes will give it the flexibility to grow according to market conditions. All of Aeromexico's larger planes were built by Boeing Co.

Boeing shares rose $1.61, or 2.2 percent, to $73.64 in midday trading.

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