First of all, you can't make aircraft for cfs1 without Abacus's Aircraft Factory, which is now off the press. In other words, unless someone will sell you an old copy, you can't make CFS1 A/C. Secondly, you can create CFS1 missions in three ways. A) The old spreadsheet way. You can get that from the official CFS1 site. B) CFSME, a program by Keith Bedford. Its a good program that'll allow you to create mission anywhere in the world. It is kinda complicated though. C) CFS Mission Editor 3.03 by Cor Dikland. This is a great program that simplifies mission building. It's major drawback is that you can create mission in European Theater.

Hope I Helped,
Will

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Not from what I've been told. It's no longer listed on the Abacus website. You might find it somewhere like Ebay.

You might not need to create aircraft anyway. There are examples of most types already available. They might need a little work to make them suitable for missions. FS98 aircraft will need a DP file & the AIR files might need a few tweaks. Check out my tute for converting them to AI Only drones for use as wingmen & enemy aircraft. http://www.simviation.com/lair/AI%20drones.htm