Cargo planes usually travel on direct flight paths and there is zero risk of a traffic jam in the sky which also adds to their uncompromised speediness of delivery
Planes can be fully chartered with larger freighters able to carry up to a massive 110 tons. This type of shipment is of course rare, but possible nonetheless, though most shippers opt for a space in the hold, paying for only their portion of the flight.
Air is an extremely low risk mode of transport. In terms of product, perishable items have a limited shelf-life and high-value goods require tight security measures, making both of them ideal candidates for air freight. In regards to packaging, damages are less likely to occur once on route as flight paths can quickly be adapted in bad weather and with far more ease than other logistics transport modes.