Hand carry suits small items that fit in a courier's baggage. Common examples include machine and tooling components, spare parts for a stopped line, prototypes and samples, electronic components, medical devices, legal and commercial documents and small, high-value equipment. If an item is too large for baggage, next flight out or a charter is the alternative.
Some items are restricted on passenger flights. Dangerous goods, including many lithium batteries, chemicals and fuel-containing parts, have strict rules and some cannot travel with a courier at all. Describing the item accurately when booking avoids problems at the airport.
The item also needs to be packed so it can be inspected and carried safely. SameDayAir.com confirms what the item is, how it is packed and whether it can travel by hand carry before the courier is booked.