It's $500 cheaper to get a round-trip ticket than to fly one way from Sydney to Washington D.C.
Basically a flight between A and C which stopped at B (for refueling or to take on extra passengers or something) was cheaper than a flight from A to B. But for some reason the airline would only sell tickets from A to C with the condition that you could not get off at B. Some guy flew from A, tried to sneak off at B, and got caught. He claims the security guards roughed him up, and tried to sue the airline.
At the same time, Lufthansa also offers a connecting flight from Delhi, India, to Frankfurt then to Toronto. This one, although much longer, costs $1.2k.
Then I stopped worrying about the world's oil supply.
As you would expect, the airline wouldn't let him just board in Amsterdam. So he packed his things and took a €75 train to Berlin early in the morning, and had his family wish him farewell later that evening back in Amsterdam, during his connection.
It was a pain in the ass, but it saved him a ton of money, at great expense to the airline.
http://www.skyscanner.at/flights/fran/ytoa/100730/100802/air...
The cheapest offer is 750.79 Euros for the round trip (and direct flights to boot).
In south america, many of the one-way flights costs more than return.
And it was cheaper to fly from Rio to Bogota via (get this) Miami !