|Aircraft are the best way of quickly getting relief supplies to remote areas or places where roads have been destroyed.
The UN's World Food Programme is using DC-8 and C-130 Hercules military transport aircraft to deliver supplies to tsunami survivors in Sri Lanka and Aceh in northern Indonesia.
Aid can be delivered to local airfields or dropped directly out of the back of planes to people on the ground. Each aircraft can deliver 18 tonnes of supplies in one drop.
Many agencies also use light or short take-off aircraft to fly in supplies to small airstrips where larger planes cannot land.
In other instances, aid is carried in netting slung below helicopters, allowing for quick pick-ups and deliveries.