For decades, Boeing looked over its shoulder disdainfully at Airbus. In recent years, Boeing has been in the wake turbulence of Airbus. Today, Boeing better be looking over its shoulder again, this time at Canada's Bombardier. With the announcement on March 16 that Bombardier will produce a 110-130-seat jetliner, the Canadian aircraft manufacturer is moving into the big leagues. Bombardier has long been a successful manufacturer of turboprops and regional jets, all but inventing the latter market. The 110-130-seat market puts Bombardier at the lower end of the big-jet marketplace dominated by Boeing and Airbus. Bombardier plans to seek government...