Terminal 1:

  Club: United Club.
  Location: Bottom of the escalator in Concourse C.
     Nearest Gate: C1

  Terminal 2:

  Club: Delta Sky Club.
  Location: Between the two wings of Concourse D.
     Nearest Gate: D2

  Terminal 3:

  Club: Escape Lounge by Centurion.
  Location: Between Concourses E and F.
     Nearest Gate: E1 (but not very close)