They scam people, taking advantage of foreign nationals unaware of the standard pricing in USD. They offer flights at suspiciously low prices, yet Delta has no record of it. No confirmation email gets sent upon purchase. If you call them up about the lack of confirmation- they tell you, just as the other reviews detail- that the flight is sold out and that they can get you an alternative one with stops for twice or thrice as much. Again, no confirmation, delta has no record. I didn't fall for this- but a sweet lady on my bus did.