Not so long ago, the F-35 fighter jet was the hottest ticket in the international arms market. Though it had suffered teething pains in development, going over budget by 50 percent in its first decade,

Shares of defense prime contractor Lockheed Martin have been under siege amid changes in U.S. leadership and questions about the viability of technologies it produces.Now, Canada is questioning its purchase of Lockheed’s F-35 jet fighters,