Pax operations were profitable for UPS and did very well. The reason why UPS stopped pax operations was because other charter operators were operating larger, newer aircraft (737, 75, A-320 and larger). UPS did not want to invest in aircraft just for passenger operations. UPS decided to stop the operation a few months ago before it would turn into a money losing operation due to the increased competition.
With the 75's and A-300's there have been some 72's parked. Why operate 2 72's when one 75 can do the job.