US Airways says it is now a creditor of American Airlines parent AMR Corp., the company it's trying to force into a merger.

US Airways said in a filing Thursday in U.S. bankruptcy court that it supports AMR's request for more time to draft a reorganization plan.

But US Airways says it could change its mind if AMR, which wants to stay independent, doesn't follow through on a promise to seek alternatives such as a merger.

US Airways spokesman John McDonald says his airline paid $600,000 for AMR bonds with a face value of $1 million so that it could participate in the bankruptcy case.