I don't believe that would affect the length of flight. Addition: Without fins model rockets become unstable. YOu could cut some out of nanila folders and attach them with masking tape. Be extra careful that they are straight.
Challenger was destroyed in a launch accident on January 28, 1986. Columbia was destroyed during reentry on February 1, 2003. The surviving four shuttles are Enterprise (flight tests), Discovery, Atlantis, and Endeavour (built to replace Challenger).