For crews ferrying airplanes for storage at Marana, normally they would be flown home on a commerical flight from Tucson. If the plane is owned by an airline, one of their crews would ferry the airplane. If the plane owned by a leasing company or is repossessed, it would likely be flown by a contact crew. As far as what is done with the airplane, that depends on what the owner (whomever that is) is able to do. Short term storage airplanes have to be run up and taxied once a month, usually that is accomplished by a third party maintenance facility, which would also prep the airplane for storage. Long term storage, requires draining fluids, possibly replacing lubricants with a fluid that is designed to prevent internal corrosion and drying out of the seals (pickling), plugging up all areas where birds or bugs could nest; would also be most likely done by a third party maintenance company. Third party maintenance facilities, rarely if ever, have their own flight crews. If the airplane is to be scrapped, usually all useful components are removed for reuse and then the airplane is chopped up (literally).