Here are the remaining questions. I'll close them out at 1600 MSP time on Thursday, 30 June if there are no takers.
8. While you're spending the night in Omaha, you decide that since you've been to the easternmost, southernmost, and westernmost cities served by NC, you may as well fly to the northernmost city. From Omaha, you take a two stop to Sioux Falls, a three stop to Minneapolis, and a one stop to the northernmost city. What's the northernmost city, and how will you be getting there?
Partly answered: still waiting on correct intermediate stops between FSD and MSP. Routing is OMA-OFK-YKN-FSD-xxx-xxx-MKT-MSP-DLH-YWG.
9. After spending the night in the northernmost city, you retrace your route to MSP, then take a nonstop to MSP to ORD. By now, you're ready to go home. You think briefly about taking the traditional NC route from ORD to DTW via JXN, but then you see you can take a more northerly route, on one of NC's new DC-9-50s. Your flight makes three stops; what are they?
Not answered yet.