These countries are grounding the Boeing 737 MAX 8

US President Donald Trump has bowed to pressure and joined the growing number of countries who have grounded all Boeing 737 Max-8 aircrafts.

The company says in the aftermath of October's Lion Air Flight crash, it has for several months "been developing a flight control software enhancement for the 737 MAX, created to make an already safe aircraft even safer".

For the past several months and in the aftermath of Lion Air Flight 610, Boeing has been developing a flight control software enhancement for the 737 MAX, created to make an already safe aircraft even safer.

The choice of Europe over the US National Transportation Safety Board for the analysis of the black boxes is a strategic decision for Ethiopian Airlines and the nation's government, said Asrat Begashaw, the carrier's public relations director.

The grounding of the aircraft has resulted in airlines around the world cancelling and rescheduling flights.

"Guests can book with confidence knowing that we continue to fly throughout the network with the safety of guests and employees at the forefront", it said.

It is far too early to know the cause of Sunday's crash, but observers have noted it may have some similarities to the Lion Air crash in October.

The FAA declined to comment on the incidents that pilots reported, but said it was not aware of any verified reports of MCAS-related issues in the U.S.

He said the company was using alternative airlines including SAS, AirFrance and KLM to rebook and that he believed customers would come back to Norwegian Air if they reopened flights on the MAX in the future.

Norwegian has cancelled United States flights from Edinburgh Airport after Boeing's 737 Max plane was banned from operating in the UK.

Since the Indonesia crash, there has been a focus on an automated anti-stall system in the 737 MAX that dips the aircraft's nose down. All three carriers vouched for the safety of Max aircraft on Wednesday.

A Boeing 737 Max takes part in flying display at the 52nd Paris Air Show at Le Bourget Airport near Paris, France, June 20, 2017.

Foreign investigators examine wreckage at the scene where the Ethiopian Airlines Boeing 737 Max 8 crashed shortly after takeoff.

An Indonesian forensic police officer takes samples from recovered belongings of the passangers of the crashed Lion Air flight JT610 previous year.

"Boeing is an incredible company", Trump said. Both flights crashed minutes into their journeys. Anonymous members listed issues with, "unintended nose-down situations" when flying the planes.

The new variant of the world's most-sold modern passenger aircraft was viewed as the likely workhorse for airlines for decades.

WestJet said it is in the process of grounding its 13 Max aircraft, and asked for "understanding as we work to rebook all guests affected as quickly as possible".

"However, this investigation has just begun and to date we have not been provided data to draw any conclusions or take any actions", according to the Continued Airworthiness Notification to the International Community for Boeing 737 MAX 8 operators.

"We can confirm a rising interest on the aircraft types we are operating", a spokesman for Swedish-based SAS said.