China's civil aviation regulator issued an airworthiness directive on the Boeing 737 MAX plane on Thursday allowing it to fly in China without legal concerns.

However, it doesn't mean that the jet can fly in China at once. It will take time for domestic airlines to adapt to the plane and train pilots.

It has been more than two years since the jet was grounded around the world following two fatal crashes that killed 346 people-an Ethiopian Airlines jet crashed six minutes into a flight from Addis Ababa in March 2019, less than five months after another Boeing 737 MAX flown by Indonesia's Lion Air plunged into the Java Sea.

The Civil Aviation Administration of China said three conditions must be met for the plane to be put back into service in China: updated designs must pass airworthiness inspections, pilots must receive adequate training and the cause of the crashes must be clear and the modifications made have proved effective.