I use a custom vJass system which i was going to share, here is a sample map of it where it shows you how to use it!
It is really simple and you don't need to know vJass at all to use it, just copy the triggers into your map, and then in the "airplane library" trigger, there is a place where it says "REGISTER YOUR PLANE TYPES LIKE THIS", and below you have some lines where it says "registerPlaneType('some unit id')". Just copy+paste this line for each air unit you want and change the unit id for the one of your unit. To see what id your unit has, just press ctrl+D in the object editor.
When you make your own units, remember to set the turning speed to something very low, like 0.06. You can hold shift while you click the field to allow such small numbers into it. The lower the speed of the airplane, the lower you want the turning speed to be aswell.