BAO's Flight Simulator Flight Shop (FSFS) is a great add-on for Microsoft's Flight Simulator 5.1 that not only 'fixes' many bugs and incomplete features in the original release (such as blocky coastlines and the ATC), but allows you to create custom planes. If you have both FS5.1 and FS98 installed, there exists a converter (link below) that allows you to have the planes you create in FSFS work in the FS98 version. The program is quite complicated, but your effort to scale the steep learning curve will be rewarded with a powerful and versatile application that can bring just about any flying object in your fantasy to reality in FS5.1. If you are not interested in designing planes but enjoy FS5.1, you can still enjoy the many bugfixes and additional features (including better-looking buildings and more airports) that this add-on includes. All in all, a great add-on to a great program that was worth the money when it came out, and remains very useful to this day; you can still find plenty of fan-made planes on the Internet that were designed with this underdog.Reviewed by: Underdogs