Which [OW hub] airports have you been to many times but never exited?
Next week will be the first time I actually exit JFK as far as I can remember. I've been through JFK airport for connections several times a year in the last decade or so where OW has been my preferred alliance, but oddly I can't recall ever having left airside except to change terminals. I've been into NY city several times but always via EWR or overland from elsewhere. (I think this reveals I don't work in the finance sector!) It was similar for DFW and ORD - years of connecting through DFW or ORD several times a year before I had reason to actually leave the airport and visit Dallas or Chicago, although both of those streaks were broken (i.e., I exited) many years ago now.
So for a fun thread, which of the OW hub airports have you visited many times for connections but where you have never actually left the airport? How many non-exiting-visits has your run stretched to?