Flugtag's got wings -- and plenty of nuts BY DAVE BARRY These days we take flying for granted. We walk aboard commercial airplanes, and although we don't understand how they work, we're confident that, thanks to the extremely sophisticated technology embodied in these complex machines, some teeny part, possibly in the toilet, will malfunction, and we will be delayed. But sometimes planes actually fly. And when they do, they become soaring monuments to the brave pioneers who made modern aviation possible -- people like Wilbur and Orville Wright Brothers, Amelia ''Air'' Hart, and Earl P. Flinchwater, who developed the computer...