R3500vdp is sadly mistaken when he lumps Star Air in the same category as Air Universal.
Oddly enough, the latter has just about completed its process to obtain a JAR operating certificate, and additional 747's are in the works.
A rather well run company Air Universal is, and pays its bills/salaries on time.
Spotters, OTOH, generally have no particular idea about the inner workings of airlines in general, and charter airlines in particular.
Suggest you back up your so called 'knowledge' about particular airlines, R3500vdp, so that you don't prove you are a bigger fool than has already been aptly demonstrated.
And, as for TriStar500, you might be surprised to learn the Air Universal TriStars are now engaged doing sub-service for Libyan Arab Airlines, as LAA's A300-600's seem to be on the ground more often than in the air.
The -250 in particular, is doing about ten hours per day, with nil defects, generally.
How do I know, you ask?
I personally fly it nearly every day.
In the LHS, of course.