 Without this clause , the two carriers would have likely been in serious trouble — 1928 estimates for the two ships put Lexington at an actual tonnage of 35 @,@ 689 tons and Saratoga at 35 @,@ 544 , though on official lists the number given was 33 @,@ 000 tons with a footnote that stated " [ this number ] does not include weight allowance under Ch . 11 , pt . 3 , Sec . 1 , art . ( d ) of Washington Treaty for providing means against air and submarine attack " . This tonnage was used by these ships for their entire careers . 
