The manufacturer said it would continue its production rate of 52 aircraft per month, but its MAX fleet would not be delivered to airlines or leasing companies.
However, the FAA said this week it had mandated that Boeing update its flight software and training on the aircraft.
Investigators looking into the Indonesian crash are examining whether the software automatically pushed the plane's nose down repeatedly, and whether the Lion Air pilots knew how to solve that problem by throwing toggle switches and cancelling the automated nose-down commands.
The accounts of the recent crashes were echoed in concerns registered by U.S. pilots on how the MAX 8 behaves.
Experts say other possible causes of the crashes are being investigated, including other malfunctioning systems and pilot error.
Boeing737 MAX 8 and 9 planes will remain grounded for "weeks" at a minimum until a software upgrade could be tested and installed in all of the planes, USA lawmakers said on Thursday.
US, home of Boeing - the world's largest aircraft maker, was one of the last countries where the plane model was still allowed to operate.
The delayed flight ET302 took off from Ethiopian capital Addis Ababa at 08:38 local time (05:38 GMT) and was bound for Kenyan capital Nairobi.
Jurgen Klopp: Liverpool are back where we belong
Maybe we were trying to play defensive and trying to score goals and maybe that was wrong and today Liverpool were better. The second half I was really happy by how mature the performance was, how strong we looked, how good we defended.
Retail inflation seen rising, industrial growth may soften
Gas prices for U.S. drivers were $2.31 a gallon on average in February, up from $2.25 in January, according to the U.S. The core PCE price index increased 1.9 per cent on a year-on-year basis in December after a similar gain in November.
Suspects Wanted in Bitcoin ATM Double-Spending Scam
According to a report in Canadian news publication CBC , just less than half the attacks on Bitcoin ATMs took place in Calgary. The cities which fell victim to the attack include Calgary, Toronto, Montreal, Winnipeg, Sherwood Park, Ottawa and Hamilton.
Pi Day 2019: Where to find deals around metro Detroit
Celebrations and promotions have surged in the United States since Congress passed a resolution supporting March 14 as Pi Day . You're in luck-California Pizza Kitchen will offer slices of its Key Lime Pie for (spoiler alert:) $3.14 (pre-tax) on Thursday.