Hi Mike,
thanks for the quick response, At first the aircrafts were not in the FS9 aircraft folder I manually copied them from the WoAI aircraft folder. In the FS9 Scenery/World folder there are two traffic files: traffic.bgl and traffic030528.The second traffic file refers to Ultimate traffic that I have also installed and those aircrafts are flying around. Like said never have had this problem before.I installes 10-20 WoAI packages in one go as I always have done.
Rob