Bankruptcy Judge Sean Lane yesterday denied a request by American Airlines parent AMR Corp. to abandon collective bargaining agreements with its pilots' union, Reuters reported. Judge Lane turned down American's motion in part because it would give the carrier unrestricted ability to temporarily lay off pilots and engage in code-sharing. Judge Lane said that AMR failed to show that such "unfettered discretion" was necessary for its own operations or that it was common in competitors. AMR said that it would alter its motion and resubmit the request to terminate its agreements with the Allied Pilots Association by Friday.