Pretty much everything in that article is the opposite of my numerous experiences. You goto ticket counter just like normal and declare the firearm, they look at it, stick a card in the outer bag and verify you have the only key. You also can travel with ammo as long as it's in 'original package'. Then after that it depends on the airport, some you just walk it over to tsa just like an oversized bag. All in all it takes about 10min extra. Very easy, never been hassled at all. Each airline has their own rules which are clearly spelled out on their websites. I've never tried sticking a bunch of camera gear in the pelican but it wouldn't be difficult, they just look in the box, at no time do they touch it so you can have whatever under it. Xray might pickup on it and they ask you to open, which is why you walk it over to them.

There's a reply to that comment that casts doubt on its accuracy. I'm not sure which is correct but felt worth pointing out.