Heading to #bankruptcy court for Day 4 of #AMR. Company’s HR head Jeff Brundage (who oversees labor issues) will take the stand. Brundage to argue biz plan maintains base pay rate as much as possible, outsources certain jobs where necessary. #AMR Brundage concedes what #AMR unions have argued: that biz plan seeks steeper labor cuts than pre-#bankruptcy negotiations. But justifies: Back then…