 For example, if aircraft operating expenses total $120 for a flight with pilot and three passengers, each of the three passengers could pay not more than $30 (one fourth) of the expenses with the remainder paid by the pilot.In many countries, private aviation operates to less strict standards than commercial aviation.For example, in Canada and the United States, aircraft owners are allowed to perform basic maintenance tasks (such as oil or tire changes) on their own aircraft, but only licensed mechanics may perform those tasks on aircraft used for commercial operations.