American losses of merchant ships according to the U.S. Joint Intelligence Committee. Daily summary dated 9 January 1942

An item reported that the USA since the outbreak of the war on 7 December lost 70,206 tons (confirmed and presumed). The Pacific were 8 USA-flagged of owned with a total tonnage loss of 37,175 tons of whixh 6 ships of totally 31,335 tons by Japanese submarines and 2 of totally 5,840 tons by aircraft. Another 4 ships of totally 19,214 tons were such long overdue and presumed lost. Most ships were lost in the first days after the outbreak. In the last two weeks were no losses reported and none vessels in convoys were attacked.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 30 dated 9 January 1942