Registered airmail tracking is important because it provides peace of mind for the sender and receiver by making it possible to check where the package is at all times. Registered airmail tracking is generally more expensive than other forms of shipping, and a signature is required from the receiver.
The extra security provided by registered airmail tracking reduces the chance of a package getting lost in route to the intended destination. This type of service is not recommended if there will likely not be someone to sign for the package when it arrives. If the package is not signed for, the receiver will have to pick up the mail at the local post office.