AMERICAN AIRCRAFT IN ROYAL AIR FORCE SERVICE 1939-1945: BOEING MODEL 299 FORTRESS. (E(MOS) 276) Fortress Mark I, AN529, on the ground at Ayr/Heathfield, Ayrshire, shortly after arrival from the United States. AN529 joined No. 90 Squadron RAF as ?WP-C? and was written off after a forced landing near Fort Maddalena, Libya, on 8 November 1941. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205208166