Thirteen congressmen wrote to UAL Corp. seeking to delay a policy requiring some travel agencies to use their own credit card merchant deals

, The Beatreported. United last month informed an unconfirmed number of travel agencies they would need to pay the airline in cash and process client cards using their own merchant agreements. The requested delay, of 60 days, would allow Congress to evaluate the policy's likely effects and take action to mitigate them "if necessary and appropriate."