How is midway secondary? Because it is not the "main" airport that serves Chicago.
BUR does not cut it for the LA area, but I would count SNA. DAL is very much secondary. Detroit City is a certainly another Detroit airport, but it hardly qualifies in this thread. Let's read my post again: "Which cities have more than one FULL service commercial airport... where neither is considered "secondary."
Flint??? Are you serious?
New York has more than one primary airport.
Does the airport have an airline VIP club, does the airport split arrivals/ departures, does the airport have widebody traffic?
Sure, WN may have 10000 flights a day out of an airport, but I would still consider it a secondary airport if it not the airport that first comes to mind when you think of the city.