I have a new set of seat configurations built, but I am not sure how I can update the actual aircraft to use them. Any help is really apreciated.
Go to your Fleet Management screen. It will bring up a list of your aircraft. On the left hand side of the aircraft information, there is a checkbox. Click the checkbox of the plane you want to update. At the bottom, a menu will appear of all the options you have in altering your plane (configuration, pilots, location, and fleet assignment). Then just click the green box on the bottom right. I think it says 'Submit' or something.