When you can sell [empty seats] at the gate for an upgrade for 500 bucks or 600 bucks... it makes all the sense in the world.
![When you can sell [empty seats] at the gate for an upgrade for 500 bucks or 600 bucks... it makes all the sense in the world.](http://cdn.quoteddaily.com/images/david-neeleman/when-you-can-sell-empty-seats-at-the-gate-for-an-upgrade-for-500-bucks-or-600-bucks-it-makes.jpg)