Air Canada /zigman2/quotes/207443554/delayed ACDVF +0.83% /zigman2/quotes/208264916/delayed CA:AC +0.38% said Wednesday it has removed Boeing Co.'s /zigman2/quotes/208579720/composite BA -0.56% 737 Max aircraft from its flight schedules until Feb. 14, 2020. The air carrier had previously said the planes, which have been grounded by regulators since March for safety concerns, following two deadly crashes, would be grounded until at least January. "We are taking this prudent step as a result of the ongoing regulatory uncertainty about the timing of the aircraft returning to service," said Chief Commercial Officer Lucie Guillemette. "The extension will give us scheduling predictability through the implementation of the first phase of our new reservation system and the required stability as we prepare the second phase of the system roll-out, introducing it into the airport environment." Last week, American Airlines Group Inc. /zigman2/quotes/209207041/composite AAL +1.23% said the 737 Max planes would remain out of service until mid-January, while United Airlines Holdings Inc. /zigman2/quotes/205037281/composite UAL -0.19% has previously said it the planes were on its schedule from December. Air Canada's stock shed 0.7% in afternoon trading, while Boeing's stock rose 0.3%, the NYSE Arca Airline Index /zigman2/quotes/210598447/delayed XX:XAL +0.57% inched up less than 0.1% and the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -0.46% has slipped 15 points, or 0.1%.