Bombardier "bet the farm" on the C-series airplane.  Reports from knowledgeable people state that the plane has great fuel economy, first class technological features, and a great future.  Bombardier did not have the $$$$ to finish the project.  Developing modern, highly-efficient. economical planes costs an enormous amount of money.  Boeing recognized this weakness & saw an opportunity to push Bombardier to financial failure, leaving one less competitor.   In the US , political conditions were right for Boeing to get this done.  Presto!  Unfair trade complaint & huge tariffs. Airbus, changing its own tune from critic to supporter,  has stepped in to save the day & scuttle Boeing's plans.  Bombardier lives to fight another day.  A very good airplane of Canadian design will makes its entry into the aeronautical world.   A satisfactory ending