You know what the worst thing you can ask a flight attendant is? "How much longer?!" Not surprisingly, they like it even less than your dad did, except they can't threaten to turn the plane around and go home.
But there are some flights that seem so long -- like, an-entire-effing-day-of-your-life long -- that even the most frequent of flyers can't always hack it. If you thought your long haul from Miami to Seattle seemed interminable, it pales in comparison to the world's 20 longest nonstop flights, ranked here by mileage.