American Airlines said Monday that it reached an agreement with Boeing to reimburse the airline for financial damages incurred last year from the grounding of the 737 Max, which is now in its 10th month.

Airlines have lost more than $1 billion in revenue because of the grounding after two fatal crashes. Boeing and Southwest Airlines ⁠— the largest U.S. operator of the 737 Max ⁠— disclosed they had reached an agreement last month.

American didn't disclose the terms of the agreement, but as CNBC reported last week, it plans to share a portion of the compensation with employees. American said the compensation would add $30 million to an employee profit-sharing program, payable in March. Southwest had taken a similar step, saying it would share $125 million with its workers.

American's pilots deserve more compensation, their labor union, the Allied Pilots Association said. Dennis Tajer, a Boeing 737 captain and spokesman for the union, called the profit sharing increase a "good start" but not enough because pilots lost out on income, not just profit sharing. He added that the airlines some 4,000 Boeing 737 pilots can't simply start flying an Airbus plane.

American flies older 737s but has had to curb its growth for the year because of the Max grounding. American in October forecast the Max grounding would cost it $540 million in pretax income in 2019. The full financial toll on airlines isn't yet known because it's not clear when the planes will fly again. American and Southwest removed the planes from their schedules until April, while United pulled them until early June.