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An Airline Pricing Puzzle

Yet another airline pricing puzzle.? A visitor tells me that he bought a Lufthansa ticket from Turin, Italy, to Bonn, Germany, and back, for $220, which includes flights to/from Frankfurt plus the fast train to/from Frankfurt airport.
Alternatively, he could have bought a Lufthansa ticket from Turin to Frankfurt for $280, and then paid for the train ticket (probably another $72).? The prices were for the exact same trips, and he acquired the pricing information essentially contemporaneously.? Why does this happen? It might be that there is competition for flights from Turin to Bonn, but in fact there are no non-stop flights on that route.? Even by the anomalous standards of pricing air travel, this kind of price discrimination seems unusually bizarre.