2.4Ghz was mostly taking over 10 yrs ago.
There are specialty radio shops that now convert old-school transmitters to 2.4Ghz now.
I'm thinking of sending in my 2 old early-80's Futaba 8jn transmitters for conversion.
Interference is now unheard of. The 72Mhz and 50/53Mhz bands are still available, but much less used.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !