[mrguyorama]

They didn't bring knives, they brought box cutters, because those private security groups were actually okay at screening things like knives.

Meanwhile, the modern TSA fails something like 90% of their own tests, in terms of letting stuff through. Many people who every-day carry stuff like knives talk about forgetting to remove their pocket knife, and getting it through TSA accidentally.

[SoftTalker]

I don't think an ordinary pocket knife was prohibited pre 9/11 anyway. I used to carry a little "Swiss Army Knife" everywhere and never recall issues at airport security (though I didn't then and still don't fly much).

[kelnos]

In the mid-00s I had a Leatherman multitool with a knife. I was constantly forgetting to take it out of my pocket before going to the airport, and never once did the (then-fairly-new TSA) even mention it, let alone do anything about it.

I finally lost it in 2008 or so when a bouncer at a club wouldn't let me in with it (and I had parked quite a ways away and waited in line for too long for me to consider going back to put it in the car). So... nightclub bouncers are more effective at screening weapons than the TSA.

[hristov]

A boxcutter is a type of knife.