Originally Posted by
ATOBTTR
There are a handful of domestic routes coded as "Delta One" which also come with SkyClub access but IAH-DTW is not one of those routes (it is standard domestic First Class) so you will not have complimentary SkyClub/Lounge access based on your FC ticket. FYI, there's actually no SkyClub at IAH anyway, only AF & KLM partner lounges though if you happen to have Priority Pass, you can access these lounges as part of the Priority Pass program.
I used the AF lounge in IAH last year on a domestic itin while they were still allowing AF/KL partner lounge access with an SC membership. When I showed the lounge agent my SC card, she didn't really pay attention to it and asked to see my boarding pass. I was on a domestic route upgraded to F and was expecting she might try to deny access based on the domestic ticket. However, she noted I was in F and that seemed to satisfy her and she let me. Could have been a one-off thing with this particular AF agent, but it might be worth trying the AF lounge with a domestic F ticket.