What is represented by the suffix 'A' in terms of aircraft equipment compatibility?

The suffix 'A' in the context of aircraft equipment compatibility indicates that the aircraft is equipped with a transponder that has Mode C capability, along with Distance Measuring Equipment (DME) compatibility. This designation indicates that the aircraft can report altitude information, which is crucial for maintaining safe separation between aircraft, particularly in controlled airspace.

Mode C transponders play a vital role in air traffic control operations as they provide air traffic controllers with altitude data, thereby enhancing situational awareness during flight operations. The inclusion of DME capability also means that the aircraft can engage in precise navigation based on distance from ground-based navigational aids, further supporting effective and safe air traffic management.

In this context, the other options represent varying levels of equipment capability that do not include both the transponder with Mode C and DME, which is why they do not correspond to the suffix 'A.'