Below are (cropped) screen captures of fares reported by Southwest Shortcut™ before, during, and a couple days after the BNA sale. (All three fit side-by-side on one screen in preview on my computer; I hope I trimmed them in a way that shows enough info without them being too large to view properly, but ads on FT (and the profile info that will show after the post is submitted) may interfere.)

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As noted above, fares may not have actually been "marked up," but the elimination of availability in the lowest fare buckets during the sale sure gives the consumer the impression that fares were increased for the sale.