The US government has told some Boeing 737 Max 9 planes to stop flying because a part fell off one during a flight.
The FAA has said it will inspect 171 planes.
On Friday, an Alaska Airlines plane had to land suddenly after taking off from Oregon.
United Airlines checked some of its 79 Boeing 737 Max 9 planes as required by the FAA.
The airline said that taking some airplanes out of service was going to make about 60 flights canceled on Saturday.
Before, the FAA said it would “force certain Boeing 737 Max 9 planes used by US airlines or in US territory to stop flying for a while”.
They said that each aircraft needs to be inspected for about four to eight hours.
Turkish Airlines has called back five planes to make sure they are safe.
On Friday, the Alaska Airlines flight from Portland, Oregon to Ontario, California, was at 16,000 feet (4,876 meters) when it started to quickly descend because of an emergency.
The plane landed safely in Portland with 177 passengers and crew on board.
The person in charge of the National Transportation Safety Board said on Saturday that no one was sitting next to the part of the transport being looked at.
“We are very lucky that this didn’t turn into something more sad,” Jennifer Homendy said.
She said the door that came off the plane might be in Cedar Hills, Portland. She asked anyone who finds it to call the police.
At the same time, the Civil Aviation Authority in the UK said there were no 737 Max 9 planes registered there.
“We have sent letters to airlines from other countries asking if they have done safety checks before flying in UK airspace,” a message said on X, which used to be called Twitter.
Pictures sent to news sources of the damaged area showed the night sky visible through a hole in the airplane, with insulation material and other stuff also visible.
The reason for the building problem is not known yet, and no one got hurt.
Evan Smith, who was on the plane, heard a loud bang and air masks came down from the ceiling.
“They said a kid’s shirt was pulled off and blown out of the plane, but his mother held onto him so he wouldn’t go with it. ”
In a recording, the pilot asks air traffic control to change course.
“We need help right away,” she said. “We need to go back because we are losing pressure. ”
Based on pictures, the damaged area was at the back of the plane, behind the wing and engines.
The part of the airplane body that was damaged could be used as an extra emergency exit by some airlines, but not by Alaska.
Terry Tozer, who used to be a pilot, said that the part should have been fastened in place if it wasn’t being used as an emergency exit.
He said to BBC News that the passengers wouldn’t have known it wasn’t a real window from inside the plane.
If this part had been lost, it may not have changed how the plane flew, but it would have been very dangerous for anyone sitting close by.
Alaska Airlines’ CEO Ben Minicucci said that 65 planes will be kept on the ground for now. They will only fly again after they have been checked and fixed to make sure they are safe.
A recent update mentioned that over 25% of those planes were checked and they are safe to fly because no problems were found.
Boeing said it agreed with the FAA’s choice. and was working with the National Transportation Safety Board to understand what happened with Alaska Airlines.
“We care a lot about safety and we feel really sorry for how this event has affected our customers and their passengers,” Boeing said.
This is the newest issue with Boeing’s most popular airplane. It was not allowed to fly for nearly two years after crashes in 2018 and 2019.