The P-3C Orion land-based maritime patrol and anti-submarine warfare aircraft is operational in the airforces of ten countries. More than 700 P-3 aircraft have been built by Lockheed Martin. More than 400 aircraft are operational with 21 operators in 17 countries including the US, Argentina, Australia, Brazil, Chile, Greece, Germany, Canada, Japan, New Zealand, Norway, Pakistan, Portugal, Taiwan, Spain and Thailand. The aircraft carries the US Navy designation P-3, the Canadian Forces designations CP-140 Aurora and CP-140A Arcturus, and the Spanish Air Force designation P.3. P-3A was first operational in the US Navy in 1962. The P-3C first entered service in 1969 and has been continuously upgraded and updated with new avionics systems and mission equipment.