An Air Canada jetliner made an emergency landing in Calgary on Thursday after 10 people were injured when the plane violently plunged and rolled, tossing passengers around the cabin during a cross-country flight. Air Canada did not immediately confirm the cause of the problem on the jet, which was carrying 88 people from Victoria, British Columbia, to Toronto. Ten people were taken to a hospital, including six who are in stable condition, Stuart Brideaux of Calgary Emergency Medical Services said. Four others suffered minor injuries, he said. Duncan Dee, an Air Canada vice president, said two crew and eight passengers were injured.