This is a minor update to an already 20 year old graphic engine dx9 and has issues with modern graphics processors as a result. It is usefulThis is a minor update to an already 20 year old graphic engine dx9 and has issues with modern graphics processors as a result. It is useful to learn, but beware of paying for so called upgrades that only include new planes and fields. It is sad that a great product suffers from so little development and rests on past success.…Full Review »