Rob, Delta gates are usually between E12 and E17. You can find more information at dfwairport.com/airlines/delta. Thanks!
It's Terminal E. FYI: Terminal E is for: Air Canada, Alaska Airlines, American Eagle, Delta Air Lines, Frontier Airlines, JetBlue, Spirit Airlines, United Airlines, WestJet.
Terminal B
Obviously you have internet access so google dfw airport terminals. You can find it there.
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