Changing aircraft into scenery

Hi, I have fs2004. I've downloaded several free airliners from years ago (Braniff, Pan Am). I want to put them as static scenery at certain gates at different airports. I've used World of Ai but i can't change the aircraft to my Braniff/Pan Am. I also have used Traffic 2007, but it won't let me change the WOAI aircraft which makes up most of the traffic. Is there a way to do this? Please help !!