I just updated the website to allow publishing unlisted airplanes. This means that you can upload your airplane as unlisted and then publish it from its details page at a later time.
This will allow you to edit the description in your web browser prior to publishing so you can make sure it is exactly how you want it to look when it is first available for other players to see. When you do publish, the airplane will then update its publish date so that it will be considered a new post. It's a small update, but it's a useful feature that has been sorely lacking from the website since the beginning. I hope it makes things a little easier for you.