But isn't this true of any flight? The average fuel burn per hour would have to be higher over long flights than it would be over a shorter distance on any jet, and if you have a big market, you buy a big jet, or a medium sized jet for a medium sized market, and then after it keeps growing for five or six years, you swop the smaller jet for the next size up, whether its the next size in an Airbus or a Boeing or from an Embraer to a 737, that's how it works.