Hi Felix. These are the routes to June 1942 ( and subsequently) including USA-Australia; from 1943 to the Gilbert & Ellis Is, Marshalls and Marianas.
Also Study 33 the general account of Ferry and Transport Services......
http://www.ibiblio.org/hyperwar/AAF/I/maps/AAF-I-11.jpg
http://www.ibiblio.org/hyperwar/AAF/AAFHS/AAFHS-33.pdf
Losses for this area are in "Army Air Forces Statistical Digest WWII" (p.186 all losses overseas, p.209 losses enroute to overseas by Theatre/type). Note that "Pacific Ocean Area" (POA) is Seventh AF pre-July 1945 and Air Forces in Middle Pacific from July; "Far East Air Forces" (FEAF) is Fifth / Thirteenth AFs and Seventh from July; "Twentieth AF" is XX / XXI Bomber Commands to end of war.
https://media.defense.gov/2011/Mar/3...110331-045.pdf
Nick