Aircraft fleets can be insured on the basis that the deductible is so large that the owner is virtually his own insurer except for very large losses. The schemes can take a variety of forms, e.g. (a) the insurer paying if the claims arising from any one accident exceed a figure that is an appreciable percentage of the value of the aircraft; (b) similarly, but the excess is a percentage of the total value of the fleet; (c) the insurer paying only losses which, taken over the whole fleet during the course of the year, exceed a certain percentage of the value of the fleet.