Southwest is a total mess when it comes to PreCheck. All other carriers manage to attach it to your profile and PNR, but Southwest does not. Book a ticket, enter it again. Try to add it on a mobile device? You're out of luck. Check in and then try to enter it? You're out of luck. Drives me nuts. Enough to avoid Southwest on as many flights as I can. Challenge is, couple times a month, I have to take them. Please Southwest, make it easier for frequent fliers to put Global Entry to work. TSA precheck should attach to any reservation you see my rewards number on. Just fix it--it's really just a database issue. Every other carrier in the US has solved it.
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