As Tom Haueter, director of the NTSB's Office of Aviation Safety, pointed out, fuel-exhaustion accidents, as a class, seem inexplicable. "You just go, 'What are you thinking? What are you doing?'" The AP story cites a number of cases in which a pilot believed, for one reason or another, that he had more fuel aboard than he really did when he took off; but that is a poor excuse, because the bottom line in almost every case is that, when fuel gauges get close to the end of the scale, a cautious pilot lands whether he thinks they're wrong or not. An Ottumwa, Iowa, college flight instructor, Jane Berg, is quoted as calling running out of fuel "probably the silliest mistake that a pilot can make."