Southwest passengers will need to book it to their booking a few minutes earlier.

The budget airline is attempting to beat back unnecessary delays by asking customers to arrive at their departure gate exactly 5 minutes earlier than the previous protocol stated.

The new procedure comes as an increasing number of passengers are bringing carry-on luggage onto planes — after Southwest began charging for checked bags last year.

As of Aug. 1, the Dallas-based carrier now requires all flight attendants to report to their assigned gate no less than 35 minutes (up from 30 minutes) before departure on all domestic flights for Boeing 737-800 NG and 737…

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