For one thing, aircraft radio systems for aircraft even look different than the 75 MHz car radios. They have a pair of sticks, one on the right and one on the left. Depending on what "mode" you are on, the right stick has aileron and elevator, the left stick has throttle and rudder.

Most car radios have two channels.. steering and throttle. The steering is on the rotating knob and the throttle and braking are on the trigger.

It is obvious, just by looking at them, that the radios are different. Many flying clubs have very strict frequency control for operating 72 MHz radio systems. One pin for each frequency. So, if someone wants to fly on, say channel 42, he/she would grab that pin, put their AMA card or club card, in the slot where the pin came from, and then go fly. If someone else has channel 42 and wants to fly, they need to first obtain the pin BEFORE turning on their transmitter. If it's being used, it shows that person that channel 42 is in use.

They, clubs, check to make sure that the members are aware of what frequencies are in use and that they are using aircraft authorized frequencies only. It's in their best interest to do so. The FCC does check from time to time.

Other than that, it is on the honor of the operator that he/she is using the right frequency for the operation in progress, ie. aircraft = 72 MHz, or cars = 75 MHz, and so on.

CGr.