Thank for your feedback and your mentioned 747 landing challenge disable issue is my intentional coded result, because of landing challenge compares scores between players. Also, my reworks provide different flight characteristics and stability. (maybe it is slightly easier than default 747) I think this competition is unfair and can causes controversy about cheating or something.
Of course, I understand your inconvenience…
If I can, I will find out solutions. (can select default 747 and my works 747 without mod delete)
Thank you for your comment 