Thanks. For anyone else’s benefit, I can confirm the desks do close between flights but open up a little under four hours before the late flight.

Unrelated but ORD T5 is currently about the worst international gateway in the US due to the construction. The “AF/KL” lounge would be an embarrassment in a 3rd-tier domestic market, let alone as an international departure lounge for one of the nicest business cabins in the sky…