Airlines are continually evaluating the lifespan of their aircraft: costs, revenue, mission capability and maintenance requirements are just some of the factors evaluated in an airline’s decision to keep a plane flying. Many jetliners have about a 30-year service life, but in some key cases, an aircraft type’s mix of capabilities can give it an even longer lifetime pass. That’s certainly the case with the Boeing 737-200C Combi, a plane uniquely suited to operations in Canada’s North.