Traveling with firearms on a plane

So I’m on my way to teach the Utah concealed carry course in Illinois and I had an interesting experience with TSA. I am bringing four handguns with me to the class: kahr CW40, Sig p239 in .357 sig, Kel Tec p3at and my brand new STI Spartan in .45 ACP. All of my handguns were in a hard sided and locked case, just as TSA requires. I was told however that my single lock might be insufficient because the firearms are supposed to be totally beyond reach. Just thought that I would put that out there. You might consder putting two TSA locks on your rifle case or handgun case.