A year after a door plug fell off an Alaska Airlines-operated (ALK) Boeing (BA) 737 Max 9 mid-flight, the Federal Aviation Administration says that Boeing still has a ways to go before it regains the government’s full confidence.

One year after a near-catastrophic accident tipped Boeing Co. into a state of continuous crisis, the top US air-safety regulator cautioned that the planemaker’s efforts to improve its manufacturing quality are still in the early stages.

The company published a safety update detailing some of the steps it has taken to improve manufacturing quality.