Is there an ecological difference in airline that you fly? While flying may not be the most fuel-efficient way to travel, sometimes it’s unavoidable to get from point A to point B. But if you can choose, go for airlines like JetBlue or Southwest, which offer all coach seating. Since first-class seats take up more room for fewer passengers, airlines that offer all coach maximize space and increase the plane's per-passenger capacity. In the long run, the total carbon emissions per passenger are less than a plane with first-class seating sections.