WASHINGTON, Jan. 27 — Saying that overloading may have contributed to a fatal plane crash this month in North Carolina, federal aviation officials announced today that thousands of passengers flying on small planes over the next month will have to tell ticket agents how much they weigh, or step on a scale, to check whether existing estimates of average passenger weight are accurate The Federal Aviation Administration is ordering all 24 airlines that operate the small planes to collect weight information from a sampling of their flights. Investigators suspect that a Beech 1900 that crashed on takeoff in Charlotte, N.C.,...