"What we've seen quarter to quarter is an improvement in safety, an improvement in quality," Seattle-based Alaska Airlines CEO Ben Minicucci told Reuters at the International Air Transport Association's annual meeting.
"Are they yet there? No, there's still a lot of work."
In January last year, a door missing four bolts blew off a new Alaska Airlines Boeing 737 MAX jet at 16,000 feet. The ripple effect from the incident caused a crisis throughout the aviation industry, hitting suppliers, carriers and passengers.