plane chase/rapid interception script

[junkie-xL]

hey guys
in the following mission you have to steal a stealth bomber (by philcommando) at Trinity Main Airport and land it safely at Liberty Airport in the North.

I want the player to be chased by other planes by means of a trigger+script (commandfollow & commandtarget). But if I setpos the planes they mostly fly-by the target and then often lose contact (taking ages to turn up again). What am I doing wrong?

http://www.coldfritescrisis.host.sk/planejack.trinity.rar