SAN FRANCISCO (AP) — American Airlines says a jet that made an emergency landing in San Francisco after wall panels in the passenger cabin cracked loose would be flown to Tulsa, Oklahoma, for maintenance.

The airline and aviation safety experts say passengers on the flight from San Francisco to Dallas were not in danger when the panels broke after an air duct failed.

The Boeing 757-200 departed San Francisco International Airport shortly before 1 p.m. Monday, and soon after passengers heard what one described as popping noises. Then, several panels began to break loose.

American Airlines spokesman Matt Miller said the captain decided to turn around an hour into the flight to Dallas/Fort Worth International Airport.

Miller said air being forced through a blown air duct pushed the panels loose.

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