Other large air freighters already flying include the Russian-built Ilyushin Il-76, the U.S.-made Boeing C-17 Globemaster III and, largest of them all, the Antonov An-225 -- also Russian.
The UN confirmed that a white Antonov transport aircraft with false markings to make it look like a UN plane had been seen dropping supplies in an area where a rebel commander, David Yau Yau, has been operating.