MONTREAL — Air Canada has pressed pause on a new seat selection fee just two days after it implemented the policy, but not before drawing the ire of some travellers online. For years, Air Canada customers with economy fares have been able to change the seat automatically assigned to them at check-in, free of charge. However, travel agents received notice from the company less than two weeks ago that lower-tier passengers who had not purchased a seat in advance would have to pay a fee if they wan