MONTREAL Canadian plane and train maker Bombardier Inc on Friday reported a bigger-than-expected quarterly loss as it delivered fewer business jets and warned of weakness in the market for smaller corporate planes. The results showed Montreal-headquartered Bombardier faces pressure in its higher-margin business jet segment because of a downturn in global demand, even as it works to win customers for its new C****** program of narrow body aircraft. "Business jet weakness is a source of concern to us and has the potential to materially slow down the pace of restructuring progress if it worsens," said an analyst following the company who asked **t be identified.