Confirmed through a "delivery person".
Unconfirmed through a witness in the judicial sense.
"A delivery person at Tinker AFB states 'I have seen more than 30 of these white, KC-135s parked on the tarmac. I have seen six to 10 take off, one after another. They are, indeed, white with no markings.'"
http://globalskywatch.com/chemtrails/ubbthreads.php?ubb=showflat&Number=6910#Post6910