AA Elaborates On GDS Policy; NW Joins

American Airlines late last week posted to its Web site additional information regarding new distribution policies, suggesting agencies should "replace or complement" existing global distribution system agreements, where appropriate, and that travel management companies and their clients should use one of the carrier's preferred distribution channels rather than aa.com. The airline also more clearly defined when, where and how a new $3.50 per segment fee would be applied to bookings in non-prefe