A List is good for the remainder of the year in which you earn it plus the entire next year. So if you qualify in 2019, then you status is effective upon qualification through the end of 2020. Per SW's site: " Rapid Rewards® A-List and A-List Preferred qualification is based on the calendar year. Once reached, you will begin enjoying the benefits immediately. You will maintain your A-List or A-List Preferred status for the remainder of the calendar year and the entire calendar year immediately following the year in which you qualified. Southwest® may from time to time offer promotional tier status. If you received tier status due to a promotional offer, the length of your tier may not be until the end of a calendar year. Please refer to the specific promotion for the tier length."
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