I would certainly consider getting out and seeing something. Lounge access is great but 7 hours in a lounge is brutal as well. I don't remember any transit to the airport but maybe consider renting a car. Traffic can be pretty brutal on the freeways though. You could check out the JFK memorial. Maybe drive out and check out the Cowboys stadium if you are football fan (it is closer to the airport than downtown.) There are lots of museums in Dallas if that is your kind of thing.
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