Abstract: An aircraft includes a vessel checker, an image generator, an appearance determining unit, and an information transmitter. The vessel checker identifies a suspicious vessel candidate by comparing a marine vessel detected by a marine search radar with a marine vessel transmitting data with an automatic identification system. The image generator generates an image by photographing the suspicious vessel candidate after the aircraft approaches the suspicious vessel candidate in accordance with a route for approaching the suspicious vessel candidate. The appearance determining unit determines whether the suspicious vessel candidate in the image has an appearance characteristic of a suspicious vessel. The information transmitter transmits, to an external apparatus, information indicating that the suspicious vessel candidate has the appearance characteristic of the suspicious vessel if the suspicious vessel candidate has the appearance characteristic of the suspicious vessel.

Abstract: An aircraft includes an airframe, a hollow member, and a plasma actuator. The hollow member has a body and an internal flow passage. The body extends from front of the airframe to rear of the airframe and has a hollow shape. The internal flow passage extends in the body from the front to the rear. The body has an introduction port configured to introduce a fluid into the internal flow passage, and a blow hole provided more toward the rear than the introduction port, and penetrating the body from an inner circumferential surface of the body to an outer circumferential surface of the body. The plasma actuator is provided at the outer circumferential surface of the body, and disposed on one or more sides, in a circumferential direction of the body, of the blow hole.

Abstract: An aircraft includes a vessel checker, an image generator, an appearance determining unit, and an information transmitter. The vessel checker identifies a suspicious vessel candidate by comparing a marine vessel detected by a marine search radar with a marine vessel transmitting data with an automatic identification system. The image generator generates an image by photographing the suspicious vessel candidate after the aircraft approaches the suspicious vessel candidate in accordance with a route for approaching the suspicious vessel candidate. The appearance determining unit determines whether the suspicious vessel candidate in the image has an appearance characteristic of a suspicious vessel. The information transmitter transmits, to an external apparatus, information indicating that the suspicious vessel candidate has the appearance characteristic of the suspicious vessel if the suspicious vessel candidate has the appearance characteristic of the suspicious vessel.

Abstract: An aircraft includes an airframe, a hollow member, and a plasma actuator. The hollow member has a body and an internal flow passage. The body extends from front of the airframe to rear of the airframe and has a hollow shape. The internal flow passage extends in the body from the front to the rear. The body has an introduction port configured to introduce a fluid into the internal flow passage, and a blow hole provided more toward the rear than the introduction port, and penetrating the body from an inner circumferential surface of the body to an outer circumferential surface of the body. The plasma actuator is provided at the outer circumferential surface of the body, and disposed on one or more sides, in a circumferential direction of the body, of the blow hole.