So, what happens in customs? When an item is leaving to go overseas, upon arrival at the airport, parcels will go through customs, being scanned and X-rayed. Items that are restricted or banned for export will not be allowed through, so remember to check the list of Prohibited items for international posting before you book your collection.
It's very important to fill out the necessary customs forms correctly, to ensure it's very clear exactly what is in your parcel and thus prevent it from being held up. In certain situations, if the customs agent has any cause for concern, parcels may be scanned again, or even opened and checked. Another security screening method is to use Remote Air Sampling Using Canine Olfaction (RASCO) or sniffer dogs. These dogs are trained to detect certain banned and restricted items to combat prohibited goods leaving the country.
Certified mail agents will be responsible for scanning each package and securely delivering it to the correct aircraft. Usually, the packages will be collated into mailbags or containers for ease.
Then, it's time for your parcel to board the aircraft. It's likely your parcel will travel in the cargo hold of a regular passenger airplane. However, mail will sometimes travel in designated cargo planes on routes where there is a high volume of cargo. It can get a little cool in the hold, but the belly of most aircraft will have an average temperature of around seven degrees Celsius.