Following Boeing announcement concerning 737 MAX production, the latest forecast note from the U.S. investment bank Jefferies predicts a halt in production of the aircraft over three months (January, February and March). Resumption of deliveries at the rate of 42 Boeing 737 MAX aircraft per month should occur at best from April 2020. However, the stock of Boeing 737 MAX grounded since March 2019 still must be delivered. That is to say at least 400 aircraft whose deliveries will not start before the fourth quarter of 2020, estimates Jefferies. Indeed, Boeing 737 MAX return to service will take time. The time estimated by different stakeholders in the sector is 120 days for each aircraft.