One difference between the US and some other countries involves screening of checked baggage (for bombs or other dangerous items).

In the US, checked baggage screening occurs after checking your baggage. If they need to look inside, you will not be available to give them the key or combination to open any locks on the baggage or watch them inspect it, which results in the issues with locking baggage, TSA locks, accidental incorrect repacking during screening, finger pointing in case of theft, etc..

In some other countries, you give baggage to be checked to a screener station who looks at it with an X-ray; they can ask you for the key or combination to open any locks if they want to look inside, since you are right there. After screening, they put tamper-evident tape on it to show that it has been screened and not opened afterward and give it back to you to check in at the airline desk. There sometimes is a wrapping service (full wrap with plastic wrap as an additional deterrent against or detection of theft) available for a fee there.