BS .... many thanks for taking the time out to reply in such an informative way .....
I have the greatest admiration for the guys flying these tankers (and of course, on the ground) and would feel greatly disturbed if very old aircraft were being used simply for cost reduction reasons ..... 50 years is such a long, long time !!!! .....
certainly all the guys involved deserve the very best and most suitable equipment
cheers .... hobie .....