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.
In the civilian career path progression, a pilot will usually work at a regional carrier before moving on to a major airline. Regional new hires make close to $20K a year to start! While some regionals pay close to $30K after 3 years or so, it takes several years at other to make that much.