This Week's NPR Weekend Edition Sunday Puzzle

The Current Challenge (given February 22, 2004):

A private pilot has a four-seat plane, and he's offered to take three
friends up for a flight. To do his load and fuel calculations the pilot
needs to know the combined weight of his three passengers. Now, the
three passengers are sensitive about their weight, and none of them will
let anyone else know how much he weighs. And no scale at the flying club
is big enough to weigh more than one person at a time. How does the
pilot quickly get the accurate combined weight of the three passengers?

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PUZZLE
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