The US plane manufacturer Boeing has recommended grounding dozens of its 777 aircraft around the world after one of the jets suffered an engine failure.
The plane, carrying 231 passengers, was forced to return to Denver airport on Saturday.
No injuries were reported.
United Airlines and Japan’s two main airlines have stopped using 62 planes.
Korean Air says it will ground six.
In total, Boeing said 128 aircraft with the same engine as the Denver plane should be grounded.
In a statement it recommended suspending operations of the 69 in-service and 59 in-storage 777 aircraft powered by Pratt and Whitney 4000-112 engines.
Pratt and Whitney said it had dispatched a team to work with investigators.
According to the Federal Aviation Administration, United is the only US airline flying this model of 777, with the others being in Japan and South Korea.
The FAA United Flight 328, bound for Honolulu, suffered a failure in its right-hand engine.
Debris from the jet was found scattered over a nearby residential area after it returned to Denver airport.
The agency has ordered extra inspections of Boeing 777 jets fitted with the Pratt & Whitney 4000 engine following the incident.
The FAA is meeting representatives from the engine firm and Boeing.
The initial finding of the National Transportation Safety Board is that most of the damage occurred in the right engine, where two fan blades were fractured and other blades also impacted.
The main body of the aeroplane suffered only minor damage.
Atleast one passenger and one eyewitness recalled the harrowing experience.
A passenger and an eye witness to the engine explosion on United Flight 328.