The longer Boeing’s 737 Max plane sits idle, grounded indefinitely by regulators around the world after two deadly crashes, the more the company’s bottom line shrinks.

How much? Not even Boeing is ready to predict.

The aviation giant was uncharacteristically uncertain about its financial future on Wednesday. While announcing its worst quarterly results in years, Boeing said that it would not provide its customary full-year sales and profit forecast. The company stopped its popular share buyback program weeks ago. It did not offer a date for when it would deliver its already delayed update to the anti-stall system in the 737 Max, which has been implicated in the accidents.

“The timing of return to service for the Max will continue to be paced by ongoing work with global regulators and our customers,” Dennis A. Muilenburg, Boeing’s chief executive, said in a conference call with analysts.

Until the plane is cleared to fly again, a substantial chunk of Boeing’s business will remain at a standstill. As a result of the grounding, the company delivered roughly 50 fewer 737 aircraft than it originally planned this quarter, contributing to a decline of more than $1 billion in revenue for its commercial airplanes division.