Planning a trip? Make sure that you're familiar with the lock requirements of the country you intend to visit.
If you plan on travelling to the US, make sure your luggage locks are TSA-approved. TSA-compliant locks are now mandatory in the US. The US's Transport Security Administration (created in response to the 9/11 attacks) is responsible for screening all airline luggage passing through the US.
The TSA screens every passenger's baggage before it is placed on an airplane and while their technology allows them to electronically screen bags, there are times when they are required to physically inspect a piece of luggage. TSA baggage handlers possess a classified tool that opens TSA-approved padlocks and combination locks.
In the event that they are unable to inspect your luggage for security purposes, you run the risk of having your lock and/or suitcase destroyed and the TSA cannot be held liable for the damage. The UK and New Zealand are expected to follow suit shortly. Be sure to enquire with your airline and purchase the correct locks.