"Empty legs" are private jet flights where there happens to be nobody on-board, at least not until you come in. Private jet charter firms, realizing that their aircraft have to return to base at some point and often do so without the human cargo they have just ferried somewhere swanky, have taken to offering these return "empty" legs for cut-price rates. They get to make some extra money out of someone's one-way trip, and the consumer gets a cut-price private jet experience – about which more later – and the flexibility to just show up 15 minutes before take-off, get right on board and fly. The one downside, of course, is that empty legs are one-way and you have to get home again
The big question, then: do you get free champagne once you are on board? Yes! Catering will be available to you as it would be to a regular charter customer. There won't be flight attendants but you will have two pilots and one of them will serve you drinks, champagne and snacks.
Result! Which leaves us with the even bigger question: if you happen to be flying on, say, Rod Stewart's private jet, will they tell you that it's his? No, they don't reveal that. Obviously, though, they do belong to famous people. (Source: Guardian)