In an unusual decision, the European Union Aviation Safety Agency (EASA) said it was suspending all flights in the bloc by the Boeing 737 MAX 8 and 9 jets.

According to Reuters, it shied away, however, from the even rarer step of pulling the safety certification for the plane itself, focusing instead on the softer process of restricting its use by airlines. That leaves some leeway for the U.S. FAA to decide its own approach.

Flight ET 302 came down in a field soon after takeoff from Addis Ababa, creating a fireball in a crater. It may take weeks or months to identify all the victims, who include a prize-winning author, a soccer official and a team of humanitarian workers.

Boeing shares fell 6.1 percent on Tuesday, bringing losses to 11.15 percent since the crash, the steepest two-day loss for the stock since July 2009. The drop has lopped $26.65 billion off Boeing’s market value.

Of the top 10 countries by air passenger travel, all but the United States and Japan have halted flights of the 737 MAX. China, Indonesia, Singapore, New Zealand, Australia, Malaysia, India and others have temporarily suspended the plane.

Canada has no plans to ground 737 MAX aircraft but is ready to act to suspend flights if new information emerges indicating there is a problem, Transport Minister Marc Garneau said. Argentina and other South American nations are evaluating closing their airspace to 737 MAX planes, Argentina’s state-run news agency, Telam, reported.

U.S. Senator Ted Cruz, a Republican who chairs the Senate subcommittee on aviation and space, said it would be “prudent” for the United States “to temporarily ground 737 Max aircraft until the FAA confirms the safety of these aircraft and their passengers.”

Trump also fretted over modern aircraft design.

“Pilots are no longer needed, but rather computer scientists from MIT,” Trump tweeted, lamenting that product developers always sought to go an unnecessary step further when “old and simpler” was superior.

“I don’t know about you, but I don’t want Albert Einstein to be my pilot. I want great flying professionals that are allowed to easily and quickly take control of a plane!”

Trump did not refer to Boeing or recent accidents, but his comments echoed an automation debate that partially lies at the center of an investigation into October’s Lion Air crash in Indonesia. A focus there is the role of a software system designed to push the plane down, alongside airline training and repair standards.

Boeing says it plans to update the software in coming weeks.