Aviation insurance is usually written by carrier pools or individual companies that specialize in this business. Most coverage is written for general aviation, a diverse industry that includes all forms of flying except commercial airlines and military operations. The four major classes of aircraft owners/operators are industrial aid, business and pleasure, flying clubs, and fixed base operators. Aircraft hull and liability coverage is similar to the coverage an automobile policy provides because it includes physical damage, liability, and medical payments coverages. This explanation of insurance benefits is provided by Insurance Marketplace.