What is used by the AIM-120 to communicate with the aircraft after launch?

The AIM-120 missile uses a Data Link to communicate with the aircraft after launch. This is crucial for updating the missile's trajectory and target information while it's in flight. The Data Link helps maintain a connection between the missile and the launch platform, allowing for course corrections and updates based on real-time data. This capability enhances the missile's accuracy and effectiveness, providing the operator with the ability to make strategic adjustments to the mission parameters during flight.

In contrast, while telemetry links and communication interfaces serve important roles in other types of equipment or systems, they do not specifically denote the means used by the AIM-120 for ongoing communication with the aircraft after launch. The radar guidance system, meanwhile, pertains more to how the missile homes in on its target rather than how it communicates with its launch platform post-launch. Therefore, the Data Link is the correct choice due to its direct role in maintaining communication throughout the missile's flight.