IASCO in SFO hires for JAL as does Hawaiian Aviation Contract Services (hacs) in Honoruru. I think Iasco may hire for ANA also, as well as HACS. these are the only ones i know of.
Jal is always looking for folks. just start asking some questions.
I think the HACS folks are a bit less picky on who they choose, but you will still have to pass the same psyc test that all of them go through. that will be the bottom line.