The U.S. Commerce Department said today that it would launch an investigation into Boeing's (BA) - Get Report unfair trade allegations against Bombardier (BDRBF) , its Canadian rival, Reuters reports.

The probe could lead to U.S. taxes on Bombardier's new jetliner, while also pitting Boeing against Delta Air Lines (DAL) - Get Report, a Bombardier customer. 

Boeing alleges that Bombardier's new CSeries jetliners, which compete with the U.S. airline manufacturers' 737-700 and 737 MAX aircraft, are being dumped below cost in the U.S. market and are unfairly subsidized by Canadian taxpayers.

Delta last year agreed to buy dozens of CSeries planes at a price Boeing says was significantly below Bombardier's cost.

Boeing said those purchases cut into future sales of its 737 and new 737 MAX.

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