American Airlines' pilot union warned that an American Airlines merger with US Airways Group Inc. may not occur during the AMR Corp. unit's bankruptcy unless pilot groups from the carriers agree on interim contract terms, Bloomberg News reported today. If an accord is not reached “in the very near future, in all likelihood there will be no merger before American Airlines exits restructuring,” said Keith Wilson, president of the Allied Pilots Association. The pilot groups, joined by executives from both carriers, began negotiating the accord earlier this month. American, which filed for bankruptcy on Nov. 29, 2011, has said it prefers to assess mergers after it leaves court protection. US Airways has been pushing for a tie-up since January.