..The group, which launched a $250-million bid for the Aeroplan business on July 25, had agreed to increase the price to $325-million and change some other terms. At a meeting late Thursday in a Bay Street office tower, Air Canada and its partners decided to turn up the pressure, according to a source familiar with the talks. You’ve got 32 minutes to give us a ‘yes’ or ‘no,’ the group said to Aimia representatives – and no more negotiating fine details.A half-hour later, Aimia walked away,......Now Air Canada must play defence. On Bay Street, there are questions swirling as to why the airline apparently reversed course on building its own in-house loyalty program and sought to reacquire Aeroplan instead. It is possible that building from scratch is harder than Air Canada anticipated.