Which of the following has the highest priority according to right of way rules?

Emergency aircraft have the highest priority according to right of way rules due to the critical nature of their operations. When an aircraft is responding to an emergency, it often requires immediate access to the airspace and ground to safely execute its mission, which could include search and rescue operations, medical evacuations, or other urgent situations.

In the context of aviation rules, emergency aircraft must be given precedence over other types of aircraft to ensure that they can carry out their life-saving duties without delay. This prioritization helps to facilitate efficient response to emergencies, thus enhancing overall safety in the airspace.

While other types of aircraft, such as gliders, balloons, and fixed-wing aircraft, do have established right of way rules, they do not take precedence over emergency aircraft operations, which are essential and time-sensitive.