Model39:
I wouldn't trust NYC for
anything, whether it's HR218/LEOSA, or about anything else... But (IANAL) you should be OK. OTOH, FOPA is a Federal matter, as is LEOSA, and expecting them to honor any Federal law is iffy

....
incavulator:
I'm not sure
any major carrier would let you carry loaded magazines, or loose ammunition, even though the former seems to be fine with the TSA.
Don't forget that this is "theater", not Security, and making felons out of Law Abiding Citizens seem to be the goal of many people.
I can understand "unloaded", if one ignores the concept that
nobody should touch that gun while it's in the airport, but the rest of it is just silly. Presuming that a magazine will jump into the mag well, and the gun will magically chamber a round and start spraying the cargo hold is just an indication of extreme hoplophobia....
I do believe that all carriers that don't want loaded magazines insists on "factory" boxes or reloader's boxes, though.
Guess the point there is to both visit the TSA web site
and that of the air carrier you're using, and follow the most restrictive rule. Meantime, it's nice to carry a copy of the web site regs, and not to be shy about asking for a supervisor if there are any problems.
(I've never been delayed by more than a couple minutes, but I do try to be early. Makes the wife crazy when I have to declare in the first place.)
Sidebar: Hoplophobes in control.... When OH's new CHL law took effect in 2004, the BMV all but forced it's franchisees to post their facilities. (BMV local offices are not state employees - just paper pushers hired/paid by whoever owns the business. Just like a McD's....) The franchisees were told that if they didn't post, they'd lose their franchise. (LOTS of money there

.)
Those signs, then (OH has some seriously goofy rules), made it a misdemeanor to ignore the sign. No security around here, and little chance of prosecution.
A few years later, the BMV pushed the legislature into making their franchises "enumerated" locations. Places where posting is required by law, and ignoring the sign is a FELONY. Still no Security, of course....
Someday....
Regards,