DATA LINK APPLICATIONThe data link applications include only Airline Operational Control (AOC) for the pre-Future Air Navigation System (FANS) configuration. The AOC applications are dedicated to data communication services between the aircraft and the airline facility.The AOC is composed of:- remote AOC applications and,- hosted AOC applications.For the remote AOC applications, the ATSU only routes data to and from AOC peripherals. This routing is in charge of receiving ground messages and routing them to the right AOC peripheral and acquiring messages or reports from these peripherals and sending them to the ground. The hosted applications depend on airline definition and uploaded into the ATSU. These applications include standard and customized functions. The main functions are:- AOC menu display,- processing, printing and display of received messages,- generation, triggering and sending of messages.