Air Canada has 24 MAX 8 aircraft, which it uses mainly for domestic and USA routes, and cancelled London-bound flights from Halifax and St. John's, N.L., after the United Kingdom banned all Boeing MAX 8 jets from its airspace.
Regulators around the world grounded the Boeing 737 Max 8 and Max 9 aircraft over safety concerns arising from the crash of an Ethiopian Airlines flight that killed everyone on board, including 18 Canadians.
The grounding of Boeing's 737 MAX aircraft following the crash in Ethiopia on March 10 is set to cost the company orders worth $600 billion.
American's fleet includes 24 MAX 8 aircraft, responsible for 85 daily flights, all of which had to be canceled as a result of the Federal Aviation Administration's directive issued on Wednesday. In October a machine of the same type in the company Lion Air had crashed in Indonesia, a few minutes after the Start.
Flyadeal, which is a unit of the Saudi Arabian Airlines, had announced in December that it would shift from Airbus to Boeing and buy 50 737 MAX jets.
This is the 737 Max's automatic anti-stalling system which is created to keep the plane from stalling.
That process could last six weeks or more, depending on additional training needed for pilots, said Representative Rick Larsen, the Democratic chairman of the panel's aviation subcommittee.
The causes of both crashes are still under investigation.
"As the aircrafts' safety flight risks remain and are unable to be addressed in the short term, and because there is no evidence to prove the effectiveness of Boeing's proposed software updates, we thereby issue this airworthiness directive to ensure flight safety", it said. According to the report, the pilot asked to turn back only three minutes into the flight.
One of the black box flight recorder from the crashed Ethiopian Airlines jet, in le Bourget, north of Paris.
Possible links between the accidents have rocked the aviation industry, scared passengers, and left the world's biggest plane maker scrambling to prove the safety of a money-spinning model meant to be the standard for decades. This evidence helped convince US regulators to ground the model.