FlyerTalk Forums - View Single Post - How Often does Delta Change the "Booking Class" on future flights?
Old Dec 1, 2015 | 6:49 am
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MSPeconomist
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Availability can change instantly.

If you see L U T inventory, you should be able to use the cert for that flight, but remember that you need TWO seats in the same class. If you see X V E available, try doing an advanced search by fare class T or higher and you will almost always see multiple T (and therefore U and L also) seats, so again the cert should work.
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