JACKSONVILLE, Fla. – Expected delivery dates have become more of a guideline than a certainty this holiday season, and shipping giant FedEx has taken some heat this month over complaints about lost packages. Overall, shipping volume is up more than 21 percent this year. Since Thanksgiving, FedEx has an on-time delivery rate of about 68 percent. “I called FedEx in Jacksonville this morning about a package that was scheduled to be delivered on Friday,” Dana DeRoin said. “Tracking shows it arrived in Jacksonville Friday, then nothing since.”“They told me they’re so swamped, they’ve hired other parties and put packages in trailers.