One of Europe's biggest low-cost airlines is selling a year of unlimited flights for $550 — but it comes with a whole heap of strings attached

• Wizz Air is offering customers unlimited flights for a year for 499 euros ($550).
• The unlimited pass comes with big caveats, namely that you can only book flights three days ahead.
• You also have to pay a 10 euro ($11) fee every time you book a flight.

Wizz Air, one of Europe's largest ultra-low-cost carriers, is offering people the chance to buy a year of unlimited flights for 499 euros ($550).

The Budapest-based airline launched its "All You Can Fly" membership with an introductory offer that means it is 100 euros ($110) cheaper than usual until Friday.