The U.S. Federal Aviation Administration was among the last in the world to ban the aircraft.
More than 40 countries have grounded or banned the Max 8 from their airspace since the crash over safety concerns and possible parallels to an October 29 incident which saw the same type of aircraft plunge into the Java Sea, killing 189 people.
"Thousands of passengers every day depend on the aviation system to get them safely to their destinations, and we must never become complacent with the level of safety in our system".
Blumenthal said the planes "should be grounded until the FAA can assure American travelers that these planes are safe". WestJet flies 13 737 Max planes, and will book passengers on its 162 other aircraft.
"This safety notice restricts commercial passenger flights from any air operator, both domestic and foreign, of the Boeing 737 Max 8 and 9 aircraft - from arriving, departing, or overflying Canadian airspace".
Although there is no proof of any link, the twin disasters have spooked passengers, led to the grounding of most of Boeing's 737 MAX fleet and hammered shares in the United States plane maker, the world's largest. Pilots could counteract the sudden downward tilt by flipping two switches and manually holding the aircraft stable, the planemaker said.
Sara Nelson, the president of Association of Flight Attendants union, wrote the FAA on Monday asking it to conduct a comprehensive review and "take steps immediately to address concerns and ensure the safety of the 737 MAX fleet". But the company says it expects the FAA to mandate the software upgrade through an "Airworthiness Directive (AD) no later than April". A total of 18 Canadians were killed in the latest crash.
USA opposes incremental denuclearisation of North Korea
The US side has included North Korea's chemical and biological weapons in the negotiations with Pyongyang. "He said he's open to a third summit , none has been scheduled, and some time may have to go by".
On another flight, the co-pilot said that seconds after engaging the autopilot, the nose pitched downward and the plane began descending at 1,200 to 1,500 feet (365 to 460 meters) per minute.
Six airlines, including Southwest and American Airlines, operate Boeing 737 Max aircraft out of Orlando International Airport. Anonymous members listed issues with, "unintended nose-down situations" when flying the planes. The biggest impact could be on future deliveries given Boeing has almost 5,000 more 737 MAXs on order.
The senator added that despite the FAA's indications that software updates are likely coming, any such changes should be made before any more flights occur on the aircraft.
"Our teams will be working to rebook customers as quickly as possible, and we apologize for any inconvenience", American said in a statement.
Foreign investigators examine wreckage at the scene where the Ethiopian Airlines Boeing 737 Max 8 crashed shortly after takeoff.
Tim Ghriskey, chief investment strategist at Inverness Counsel in NY, said the grounding gives Boeing time to address any problems and not face another potential disaster.
"So, if we look at the profile, there are vertical fluctuations, in the vertical profile of the aircraft and there were similarities in what we saw", Garneau said.