Southwest ripped American’s proposed rule change that would alter how U.S. airlines handle their routes to Cuba, calling the idea “unprecedented” in an Oct. 10 regulatory filing.

The U.S. opened up the Cuban market a few years ago and allowed airlines to apply for routes. Only 20 daily routes to Havana were allocated to U.S. airlines.

Both American Airlines Group, Inc. (NASDAQ: AAL) and Southwest Airlines Co. (NYSE: LUV) were granted routes. When an airline is awarded a route, it’s tied to that specific city. So, an airline can’t shift its route allocations to different U.S. cities to match demand.

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Southwest balks at American Airlines