>>>remember Pro Air flew 737-400s out of there and Southwest used to fly there a decade ago.
Yep, they did, but they flew "normally in/out of DET. In fact, SWA dumped DET because of the city's failure to extend/widen 15-33.
Personally, I can assure you that had I an inbound DET flight with an emergency, I'd dismiss DET's 5,090' by 100' runway and divert the flight to the 9,000' by 150' runway at nearby Selfridge (MTC), or any of DTW's multiple runways. Better ARFF at DTW too...
selfridge 9,000 x 150
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.