China’s three biggest airlines are demanding compensation from Boeing over its grounded 737 Max fleet.

Air China, China Southern, and China Eastern seek compensation for losses incurred after the grounding of their 737 Max jet fleet. Turkish Airlines, United Airlines, Ryanair, and Flydubai have also asked for compensation.

Beijing was the first country to ground the Boeing fleet following the Lion Air crash in Ethiopia that killed 157 people in March. That followed a similar accident in Indonesia in October 2018.

The summit of 57 international regulators from 33 countries will review Boeing’s 737 MAX software and training proposals to address the underlying Maneuvering Characteristics Augmentation System during the International Air Transport Association summit in Dallas, Texas.