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International regulations prohibit aircraft from entering high-density airspace and heavily trafficked over-ocean airways without suitable avionics. The widespread use of GPS navigation and increasing complexity of passenger entertainment systems have become the latest electronics trends on large commercial aircraft. The cost of avionics plus software is approaching 50% of the total. New aircraft have multiple computers and millions of lines of software. The following sections present the most important avionics subsystems and highlight some differences between military and commercial aircraft.