I fail to see any part of the proposal that forbids booking in that 72 hour window. Rather, it seems that since the bulk of the bookings are complete before the 72 hour window, the TSA screening process will start with the bulk of the final manifest well ahead of time, reducing the amount of last-minute screw-ups. Bookings added to the manifest within the 72 hour window are simply forwarded to TSA promptly in a piece-meal fashion - not banned.
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I fail to see any part of the proposal that forbids booking in that 72 hour window. Rather, it seems that since the bulk of the bookings are complete before the 72 hour window, the TSA screening process will start with the bulk of the final manifest well ahead of time, reducing the amount of last-minute screw-ups. Bookings added to the manifest within the 72 hour window are simply forwarded to TSA promptly in a piece-meal fashion - not banned.