And in what may precede a raft of claims, Norwegian Air has said it will seek compensation from Boeing for costs and lost revenue after grounding its fleet of 737 MAX, while Indonesia's Lion Air has frozen all deliveries of the MAX 8.
Last November, the Trinidad and Tobago-based regional carrier announced that it had ordered 12 Boeing 737 Max 8 aircraft.
He told Reuters in February that the carrier wanted to swap some of its order for MAX 8s for widebody Boeing models. A November preliminary report, before the retrieval of the cockpit voice recorder, focused on maintenance and training and the response of a Boeing anti-stall system to a recently replaced sensor, but gave no reason for the crash.
The low-priced carrier, a launch customer of the MAX 8 in 2017, said it was servicing those flights with available 737-700s and 737-800s.
A spokesman for the Bureau of Enquiry and Analysis for Civil Aviation Safety (BEA) said they didn't know what condition the black boxes were.
The plane was less than four months old when it went down just six minutes into its flight to Nairobi.
Ethiopian investigators have now sent the black boxes to Paris to be analyzed - almost three days after they were recovered from the crash site.
Former FAA assistant administrator Scott Brenner told CBS News the agency still should have waited for data from the Ethiopian jet's black boxes before making its decision.
Transport Minister Marc Garneau said Wednesday's decision was made following a review of evidence about the aircraft.
The U.S. Federal Aviation Administration issued an emergency order grounding the planes Wednesday.
The Ethiopia Airlines and Lion Air flights both used 737 Max-8 aircraft.
The move came after a growing number of airlines and countries had already decided not to fly the planes or ban them from their airspace until it was ascertained there are no safety issues.
Other industry experts say that the financial impact on airlines could be lessened by Boeing Co. shouldering some of the unexpected costs of its customers.
It could also look at Grant County International Airport in central Washington, where Boeing regularly tests aircraft.
Boeing chief Dennis Muilenburg said he supported the USA decision "out of an abundance of caution" but had "full confidence" in the safety of the plane.
The cause of the Indonesian crash is still being investigated.
The accounts of the recent crashes were echoed in concerns registered by United States pilots on how the MAX 8 behaves.
U.S. Representative Rick Larsen said after a briefing with U.S. aviation officials the software upgrade would take a few weeks to complete, and installing it on all aircraft would take "at least through April".
The pilot of Ethiopian Airlines Flight 302 had reported internal control problems and received permission to return, before the plane came down and burst into a fireball on arid farmland.
The decision to prevent airlines from using their 737 MAX comes after an Ethiopian Airlines plane crashed on Sunday and killed all the 157 people from 35 nations on board shortly after taking off from Addis Ababa.