FlyerTalk Forums - View Single Post - How Often does Delta Change the "Booking Class" on future flights?
Old Dec 1, 2015 | 8:00 am
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Originally Posted by Felixishim
the AMEX DL Plat card economy BOGO cert let you use on L,U,T,X,V class on most domestic flights. it has expanded to the lower booking class after L,U,T is no longer their lowest booking class.

so book in advance for a cheap V fare and use the cert~~
OP asked the same question in the Lounge thread, where I provided this advice:

remember that the AmEx companion certs are often only valid on a subset of LUTXV fares ... just because two seats in that booking class may be available for purchase doesn't necessarily mean you will be able to apply the certificate
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