Mr. Trump said the USA government had received "new information and physical evidence" both from the crash site and other places, as well as "a couple of other complaints", which led to the decision. However, a more formal fix to redesign it won't be mandated until April, the FAA said Monday.
Speaking at the White House on Wednesday afternoon, Trump said both the Boeing 737 Max 8 and 737 Max 9 models will be "grounded upon landing" at their destinations.
"Boeing has determined - out of an abundance of caution and in order to reassure the flying public of the aircraft's safety - to recommend to the FAA the temporary suspension of operations of the entire global fleet of 371 737 MAX aircraft".
'We are doing everything we can to understand the cause of the accidents in partnership with the investigators, deploy safety enhancements and help ensure this does not happen again'.
It is not yet clear whether the anti-stall system was the cause of the Ethiopian Airlines crash.
All three will need to cancel or delay flights, especially short term, before they're able to make changes to which aircraft they fly on what routes.
Speaking at the White House, President Trump said the United States is issuing a "emergency order to ground all 737 Max 8 and the 737 Max 9, and planes associated with that line".
The announcement that Canada has closed off airspace to Boeing 737 Max 8 and 9 passenger jets has left some would-be passengers fretting over the status of their travel plans.
The FAA said it is continuing to evaluate the safety performance of the jet, but a review has thus far revealed "no systemic performance issues and provides no basis to order grounding".
Canadian Transport Minister Marc Garneau told reporters in Ottawa Wednesday's decision was made after receiving new satellite data that showed a possible similarity to a previous crash.
Canada has grounded the world's third largest fleet of Boeing 737 Max 8 aircraft, following the crash of an Ethiopian Airlines jet on Sunday.
Fennell said travelers should confirm that flights are still operating. But a brand is at stake as well. The company's shares reacted by tumbling nearly 10 points, or 2.5 percent.
However, the company's market value has dropped by almost $26bn since the crash in Ethiopia at the weekend.
First to get off the block was troubled Norwegian Air, which said it will seek compensation from the plane maker for lost revenue and extra costs resulting from the grounding of its fleet of 737 MAX.
FILE PHOTO: A Boeing 737 MAX 8 aircraft is parked at a Boeing production facility in Renton, Washington, U.S., March 11, 2019.
A spokesman for Ethiopian Airlines had said earlier that the black boxes recovered from the crashed plane would be sent to Germany for analysis.
Stacy Sternberg, 53, a scientist who lives in Chicago and Las Vegas, tried not to think about the model of plane she was on, but said turbulence reminded her during the flight. The Boeing 737 flight manual includes a procedure for pilots to counter any problems in the aircraft's automatic trim system by disconnecting the autopilot and auto throttle systems. Some pilots have reported problems with the jets' software on take-off in other instances.
The system continues to repeat the process if the computer detects the plane is still tilted at a too-high angle.