The A319 MPA appears to be a European answer to the better known Boeing P-8 Poseidon. The A319A is (or will be) powered by two IAE V2527M-A5 or CFM56-5B7 engines providing a thrust of 26,500lbf or 27,000lbf. The twin-turbofan configuration provides a maximum speed of Mach 0.82. A319 MPA is based on the airframe of Airbus A319 commercial aircraft. Future buyers might include Germany, France and perhaps the UK.
The A319 MPA is (or will be) a long range maritime patrol and ASW aircraft which can be deployed in anti-submarine and anti-surface warfare, intelligence, reconnaissance and surveillance missions. "The low-altitude loiter or search capability, exceeding range, endurance and fast transit speed make the A319 the best maritime patrol aircraft in its range." See full description.
In July 2015 the Japanese Navy sent two Kawasaki P-1 maritime patrol aircraft to the ’s Royal International Air Tattoo (). This included a slow flypast with the weapons bay doors opened. (Photo Courtesy Chris Pocock via AIN article)
Chris Pocock at Aviation International News (AIN) July 17, 2015 https://www.ainonline.com/aviation-news/defense/2015-07-17/japans-new-maritime-patroller-makes-international-debut reports:
Japan’s New Maritime Patroller Makes International Debut
The Kawasaki P-1 maritime patrol aircraft () is on display outside Japan for the first time this weekend, at the ’s Royal International Air Tattoo (). The Japanese [Navy] flew two of the four-jet machines across the Pacific, the and the Atlantic to reach the show at Fairford. They will move on next week to Djibouti for flight tests in hot and desert conditions, before returning to their base at Atsugi outside Tokyo.COMMENT
It is a very complex issue (involving tradeoffs and emerging technical trends) when considering:
1. whether jets can fly anti-submarine patrols as effectively as propeller driven aircraft and
2. whether four engines should be chosen if one assumes four engines provide a significant margin of safety over two engines.
One reason Japan is marketing the new four engine Kawasaki P-1 maritime patrol aircraft () to the UK is that the UK's previous MPA was the four jet engined Hawker Siddeley Nimrod.