1. Aircraft Categories (six categories there, Cat. 1 -turboprops < 12,500 lbs. and VLJs < 10,000 lbs., Cat. 2 multiengine turboprops of 12,500 lbs or more and LJs of 10,000 to 19,999 lbs, Cat. 3 jets of 20,000 to 29,999 lbs., Cat. 4 jets weighting 30,000 to 40,999 lbs., Cat. 5 are jets 41,000 lb. or more and Cat. 6 are ULRJs with range above 6,000 nm. 2. Mission costs: three missions are computed: 300 nm, 600 nm and 1,000 nm. 3. Variable costs (Per Hour) included fuel expense, maintenance labor expense, parts expense, and miscellaneous. 3. Fixed costs (Yearly): hull insurance, liability insurance. 4. Periodic costs: Mid-life/hot-section inspection, engine overhaul , overhaul interval, paint, interior refurbishment, modernization/modification/upgrade allowance. 5. Personnel costs. 6. Training. 7. Facilities (hangar/office costs/miscellaneous}.