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In Pocket Planes you have an option to upgrade your planes. Upgrading planes can increase their range, increase their speed, and decrease their weight. Increasing a plane's range will allow it to fly farther without having to stop at an airport. Increasing a plane's speed will make flights take less time. Decreasing a plane's weight will allow you to profit more. Each aspect can be upgraded 3 times. Upgrades cost the user bux. The price of an upgrade does not increase with each level, though the price of upgrade differs from plane to plane.