Pinnacle Airlines and its pilots must head back to the bargaining table now that the airline’s ALPA-represented crewmembers failed to ratify tentative contract language fashioned after more than four years of bargaining. Pinnacle management offered pay raises, a signing bonus, job-security enhancements and work-rule improvements, incentives deemed insufficient by some 58 percent of the voting pilots. Some 91 percent of the company’s 1,250 pilots participated in the ballot. The National Mediation Board will decide the next course of action, although both sides have expressed a desire for a swift resolution.