Registered cover posted from "SINGAPORE*15.AP.1931", carried by surface to Alor Star where it joined the regular KLM flight to Amsterdam. The KLM route from Karachi to Batavia was similar to that used by Experimental IA flight exept that Allor Star-Batavia was via Medan rathen than Singapore. The regular KLM route was used for airmail between Batavia and London. This cover fr. with 71c while the one flown by 2nd IA flight 5 weeks later needed 48c