FlyerTalk Forums - View Single Post - Does Southwest require passport for domestic travel?
Old Sep 1, 2015, 6:27 pm
  #12  
Kensterfly
 
Join Date: Aug 2009
Posts: 1,088
Originally Posted by Efrem
Note that the list at the link says "U.S. passport."

So, your expired passport - which is still a U.S. passport by any definition - is probably still fine for this purpose.
It's the "probably" that would have me worried.
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