This is what I think they should look like. They are now based in Florida so they need to be bright and cheerful. The Spirit name should be in script on the front of the aircraft like it is on the tail. The lettering should be dark blue. There should be a zigzag curvy stripe that starts behind the "S". It should start thin and and get wide so that by the time it reaces the tail it is nearly covering the tail. By the way, this stripe should be magenta. there should be a thin violet blue (the same color as the lettering) zig zag strip under the magenta stripe. It will sort of be a shadow. They need to come up with a logo and it would be on the tail (in the magenta area) in violet.