A control device for forming a communication area on a ground to control an aircraft having an antenna for providing a radio communication service to a user terminal in the communication area, comprising: a control unit that makes a plurality of aircraft perform a formation flight, and controls the plurality of aircraft such that the communication area of each of the plurality of aircraft moves while covering a part of a preset target area and the entire target area is covered by a plurality of the communication areas of the plurality of aircraft, wherein the control unit makes a flight speed of an aircraft, among the plurality of aircraft, which is covering an area in the target area in which a communication traffic of a plurality of user terminals is larger than in the other areas covered by the remaining aircraft slower than flight speeds of the other aircraft such that an occurrence of handover in the high traffic area is suppressed, wherein the communication area is configured by a plurality of sub cells, and a) wherein the control unit constructs virtual cells in adjacent two or more sub cells along a moving direction of the adjacent two or more sub cells among the plurality of sub cells in one of the communication areas or b) wherein the control unit constructs a virtual cell in a first sub cell in a first communication area and a second sub cell that is adjacent to the first sub cell in a second communication area along a moving direction of the first sub cell in the first communication area by a first aircraft among the plurality of aircraft and the second sub cell in the second communication area by a second aircraft among the plurality of aircraft. a control unit that makes a plurality of aircraft perform a formation flight, and controls the plurality of aircraft such that the communication area of each of the plurality of aircraft moves while covering a part of a preset target area and the entire target area is covered by a plurality of the communication areas of the plurality of aircraft, wherein the control unit makes a flight speed of an aircraft, among the plurality of aircraft, which is covering an area in the target area in which a communication traffic of a plurality of user terminals is larger than in the other areas covered by the remaining aircraft slower than flight speeds of the other aircraft such that an occurrence of handover in the high traffic area is suppressed, wherein the communication area is configured by a plurality of sub cells, and a) wherein the control unit constructs virtual cells in adjacent two or more sub cells along a moving direction of the adjacent two or more sub cells among the plurality of sub cells in one of the communication areas or b) wherein the control unit constructs a virtual cell in a first sub cell in a first communication area and a second sub cell that is adjacent to the first sub cell in a second communication area along a moving direction of the first sub cell in the first communication area by a first aircraft among the plurality of aircraft and the second sub cell in the second communication area by a second aircraft among the plurality of aircraft. a) wherein the control unit constructs virtual cells in adjacent two or more sub cells along a moving direction of the adjacent two or more sub cells among the plurality of sub cells in one of the communication areas or b) wherein the control unit constructs a virtual cell in a first sub cell in a first communication area and a second sub cell that is adjacent to the first sub cell in a second communication area along a moving direction of the first sub cell in the first communication area by a first aircraft among the plurality of aircraft and the second sub cell in the second communication area by a second aircraft among the plurality of aircraft.