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One you have bought an aircraft, you are able to customize it.1st,go to the configure cabin layout tab on the right of the page. Second, choose create new configuration and then choose for which aircraft. You then need to choose how many of each class you want on your planes, choose wisely!:)
Once your done, and the configuration is created,at the bottom of the list of your configurations is a few lists. '''The aircraft you have selected ''MUST'' be the same as the type of configuration's airplane type!''' Once, that's done click install and then pay for the installation. There you do! You have customized you planes!