Final answer:
The agency responsible for flight following an overdue aircraft will contact the Civil Air Patrol, local emergency services, and the Rescue Coordination Center.
Step-by-step explanation:
The agency responsible for flight following an overdue aircraft will primarily contact the Civil Air Patrol, local emergency services, and the Rescue Coordination Center (RCC). Each of these agencies plays a crucial role in Search and Rescue (SAR) operations. The Civil Air Patrol, which is a civilian auxiliary of the U.S. Air Force, often assists in the search for missing aircraft. Emergency services such as the police, fire department, and ambulance services are involved due to their capabilities in the field and quick response times. The Rescue Coordination Center, which is part of the country's search and rescue organization, coordinates the entire SAR operation, including deployment of assets and communication with other agencies.