Southwest has begun tracking duplicate bookings and will automatically cancel your first reservation without notice, including all legs on a multi-leg booking. These changes have occurred apparently because Southwest has revamped their old reservation system that previously was unable to detect duplicate bookings. Granted, it was against their policy so it's hard to complain, but if you are used to this "benefit" be aware it is no longer. From now on I will book all legs as one way reservations. I spoke with a reservations agent after receiving the email, and she explained the new policy, and with some effort was able to reinstate my original reservation at the original price.
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