Didn't DIA close that loophole by proscribing concealed carry anywhere on the facility?
I have not seen such. They can post signs that don't carry the weight of law, but the City and County hasn't passed any more laws that are in direct violation of the State Constitution that I've heard of yet. Federal law applies in "secured" areas, of course. I'll double check something hasn't changed, but I doubt it. Denver doesn't want to go to court again.
Our law here is that any public building that installs a security checkpoint that's *permanent*, and also offers safe (defined as locked by numerous lawyers) storage for firearms can disallow carry past the checkpoint.
If the building is private, that's different. The owner can post signs which carry no weight of law, but serve as a hint for respectful folk, and ask anyone to leave (standard trespass law) at any time.
This was actually entertaining up at the Republican Caucuses which they decided to hold on the CU campus in Boulder because of size. Public building. No permanent security checkpoint, and the school attempted to disarm folks, like they always do, illegally, with contacted security at non-permanent entry checkpoints.
Numerous DAs (some carrying) and lawyers walked over to the contracted security's manager had a few words with the security staff to call school officials and notify them that they were being asked to break the law.
Boulder cops watching the whole thing just laughed and waved them in, after the school told the security guards to knock it off. The cops knew the law and didn't mind at all. The school had just given their usual "no weapons" orders to their contract security folks without a single brain cell turned on.
The Regents will probably get a clue and install permanent security. Whether or not they'll offer the required secured storage, remains to be seen. A number of small rural Counties also break that portion of the law, but they're slowly learning.
Fun to hear that the high powered lawyers who were also packing, were off to "go fix the problem". I wasn't there, just got to hear about it later from one of the Attorneys. Amazingly no media picked up on it, either.