I don't know about commercial aircraft, but probably for GA aircraft it would apply.
It also works for truckers too. Imagine having both cab & trailer stripped apart. Load removed & inspected. So much for 'just in time' deliveries.
Smuggling is a serious problem everywhere.
Up here, guns coming in from the USA and drugs going out to the USA are problems. As well as illegal immigrants trying to cross into the USA.
Remember, most types of hand guns or assault rifles are not permitted up here at all. There are very few collectors who are allowed to own them.
There is NO 'right to bear arms' here. So most people just get clubbed like Nancy Kerrigan. You can walk it off in a few days. But you're still alive.
You don't need to live in the Florida Keys to experience smuggling. Although come January, I'll volunteer to move there until May. I don't need to be smuggled, I can drive myself.
"It's alright to be crazy, just don't let it drive you nuts! "
On a side note: I've shot a .40 cal Sig & a 9mm H&K MP5 on full auto (also a 7.62mm FN). Why you'd need a full auto MG is beyond me. I was pretty accurrate from about 30', but in combat, you'd be lucky to the man once in 30 rounds, even in short bursts.