Like it or not, there are certain rules that apply when we fly. Some of those rules fill books and some of them — too many — are unwritten. One rule is to not run out of fuel. Other rules — like which route to take around special airspace — either aren't shared with pilots or just keep changing. While the rules that apply to getting around the Charlotte, N.C., Class B airspace seem inscrutable, the rules that apply to ensuring that there's enough fuel aboard to reach one's destination are well-known. Executive Editor Joseph E. (Jeb) Burnside explores why things are what they are in this first installment of his monthly column for AVweb.