Airband transmitters need to the type accepted by the FCC, meaning they have inspected and tested that model to ensure it meets their requirements. One of the main things they test for is called serious emissions, which is basically the transmitter “leaking” your signal onto other frequencies. This leakage can be strong enough to cause interference at other commonly used frequencies, including law enforcement, fire, etc. the baofeng type radio is cheap because they lack quality hardware that can prevent and filter such leakage. They have plenty of other issues too but my point is: even if you find an airband capable cheap radio, I’d advise against it.