The whole muscle of which the muscle fibres are a part can develop force in several different ways, e.g. with the muscle as a whole shortening, lengthening or maintaining the same length while the muscle fibres contract. List of types of muscle contraction. Isotonic (of which there are two types: concentric and eccentric)
While some flight schools will advertise that you can get a pilot's license for around $5,000, the reality is that the cost generally works out to be more. A commercial pilot's license -- bigger plane, more than twice the flight time -- generally costs $40,000 to $50,000.
To obtain a commercial pilot certificate under CFR Part 61, you'll need at least 250 flight hours, including 100 hours of pilot-in-command time and 50 hours of cross-country flight. In addition, you'll need to get at least 10 hours of instrument training and 10 hours in a complex aircraft.