Design and development of aircraft to aircraft communication by Ad-Hoc networks This paper is designed to develop an air to air navigation like aircraft to aircraft communication (A2AComm) based on Ad-Hoc networks as a communication technology. It is a new communication framework of Ad-hoc network for safe air navigation. The main principle of Ad-hoc network is that, it will track the position of nearby aircrafts with motion, direction and it will establish communication between two or more adjacent flying aircrafts. The design of A2AComm is mainly to avoid air traffic congestion, pointing emergency location, reducing the Air Traffic Contol (ATC) workloads, and preventing aircraft diversion and air accidents. Also its an easy mode of communication between crews from one aircraft to another aircraft using audible and visual alerts. Developement of this design in not based on Global Positioning System (GPS) but fully based on WiMAX and Ad-hoc network principle. Ad-Hoc networkcommunication covers a maximum distance of 1000 meters(1 Km) and has a high bandwidth and high rate of data transmission. The systems comprise computers, communications, sensors, control technologies and management strategies. These function in an integrated manner to improve the functioning of the air transportation systems. It also provides real-time information to the aircrew to improve the safety and efficiency of air to air communication.