"We set the delivery of the 737 Max, until we find a solution", said a group spokesman.
"The truth about the crash is indeed contained in the flight recorders", he said.
But Juliusz Komorek, the no-frills airline's chief legal and regulatory officer told a press conference in Warsaw: 'There is no risk for Ryanair's summer programme.
Ethiopian Airlines says an Ethiopian delegation led by its accident investigation bureau had flown the flight data and cockpit voice recorders to Paris.
"Following the banning of the 737 MAX from the airspace of many countries, including America, which is the country that builds it, this type of plane is now banned from Iranian airspace", Jafarzadeh said.
A floral tribute at the crash site
French aviation experts on Friday began work on the heavily damaged black boxes from Sunday's Ethiopian Airlines disaster.
The crash, which killed all 189 people on board, was the first worldwide of Boeing Co's new 737 MAX jet. The airline officials said they have opened a call-in center that is open 18 hours a day to respond to questions by family members.
Airlines that serve Logan Airport are responding to the FAA's emergency order to ground Boeing 737 Max aircraft following Sunday's deadly Ethiopia Airlines crash in Addis Ababa.
Southwest and American Airlines are the US carriers using the most 737 Max jets, but the beleaguered aircraft are less than 5 percent of the fleet for each company.
Then the controllers observed the plane going up and down by hundreds of feet, and it appeared to be moving unusually fast, the person said. Peter Goelz, a former managing director of the NTSB who is now an aviation consultant, said that late call by the Federal Aviation Administration may indeed have been a factor.More news: New York Attorney General Opens Investigation into Major Trump Organization Projects