1. UML DESIGN By: J Kamala Ramya 01-07-819 Y Devika 01-07-864

2. Air traffic control (ATC) - is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other support for pilots when able.

3. ATC System is a service that provides guidance to aircrafts, prevents collisions, and manages safe and orderly traffic flow. It is a vast network of people and equipment that ensures safe operation of aircraft. The system comprises activities such as preflight, take-off, departure, en-route, descent, approach and landing. Each of these consists of many more sub activities.

4.  Preflight -This portion of the flight starts on the ground and includes flight checks, push-back from the gate and taxi to the runway.  Takeoff - The pilot powers up the aircraft and speeds down the runway.  Departure - The plane lifts off the ground and climbs to a cruising altitude.  En route - The aircraft travels through one or more center airspaces and nears the destination airport.  Descent - The pilot descends and maneuvers the aircraft to the destination airport.  Approach - The pilot aligns the aircraft with the designated landing runway.  Landing - The aircraft lands on the designated runway, taxis to the destination gate and parks at the terminal. Activities

6. ATC USE CASE FOR AIRCRAFT

7. ATC USE CASE FOR GATE CONTROLLER

8. ATC USE CASE FOR GROUNDCONTROLLER

9. ATC USE CASE FOR LOCALCONTROLLER

17. ATC COMPONENT DIAGRAM

18. ATC DEPLOYMENT DIAGRAM