I tweeted DFW Airport to ask if there was Pre at E open yesterday afternoon, and they replied merely that E8 had Expedited screening. No mention of E18. I also tweeted TSA but got no response. Between that and the traffic backup at E with the construction, I decided to try my luck at C. C20 Pre was open as advertised, but its location halfway between the 2 C SkyLink stations isn't exactly convenient. (C30, Pre open only until 10 am would seem a better choice). Maybe next time I'll try A, longer train ride but shorter walk.