someone can say to me how it is possible ju 88 mistel fly by AI?

If you mean how to set up the Mistel in FMB for the AI to use, then I believe this is explained in one of the readme files in the game folder.

i didn't find it, please show me if you can

Page 356 from the 'Aircraft Guide.pdf':

The Mistel aircraft is a very peculiar bird which presented our team with some unique challenges. The modified Ju-88 strapped to the flyable FW-190 is really a one of a kind object in the game. As such, our AI routine would need a complete overwrite to allow for complete realistic Mistel operations. Unfortunately we could not afford to spend another year doing that, so our AI Mistels cannot take-off, land or attack targets. The most an AI Mistel can do is follow a set of waypoints in the air, basically serving as a large target for other flights.

Another important limitation is that Mistels cannot be flown in online dogfight games; however they can be flown in co-op missions.

Player-controlled Mistels however do work like other planes. You can start on the ground and take-off in them, land with or without the attached Ju-88 bomb, and detach the Ju-88 bomb in the air and launch it at targets. You must launch the Mistel at least from 1 km away from the target; historically they were launched from even farther away. Just lower your engine power to about 33% of throttle, hold your target in the crosshairs for a few seconds and press the “Attach/Detach Aircraft” button to separate from the Ju-88. It will follow on your current course, while you should try to get away from the target area. The Mistel's blast is pretty big, and it will damage or destroy objects on the ground and in the air in a very large radius.

Creating a mission with a Mistel is easy: just create two waypoints for the Ju-88 (Mistel), then place waypoints for the FW-190A-8 (Mistel). With the FW-190 selected, go to the Waypoint tab of the Object window, click the Set button and click on the Mistel. This will link the two in the beginning of the mission.

You can set the first waypoint of the pair to be Take-Off, but AI flown Mistels will not be able to take-off.

When releasing the Mistel from low altitudes and at a shallow angle, it may hit the ground without exploding. Its detonator was located in the tip of its long nose, so if the Mistel hits the ground with its fuselage without an impact on the nose it will not detonate.

Combat/take off/landing flaps will only work on the Fw-190 and not extend on the Ju-88.

When the Mistel hits the ground you may sometimes hear the "I’m hit, I am going down" radio call.

great!!!!!!!!!!!!!!!I thought mistel could fly only AI, but my desire is fly on it,i'm a happy italian today! ciao