Detroit is one of their hubs, as is Minneapolis. When you fly out of Duluth (on NWA) you will be flying to one of those two cities; there are no other choices. So for my first trip I was planning to fly to Flint in October. I was surprised to find a relatively low fare of $239 for the round-trip DLH-FNT flights. In each case I would have to change planes in Detroit.
Then I started shopping for round-trip airfare to Detroit in November. The lowest available fare is $680. My first thought is that they must be having a major fare increase between mid-October and mid-November. So, I decide to look up the Duluth-Detroit for the same dates in October when I an traveling to Flint. I was surprised to see that the fare was once again $680 and up.
So, here's the deal-ee-oh. I can fly from Duluth to Detroit to Flint for $239 or I can fly from Duluth to Detroit (on the same flight as above) and NOT fly to Flint for $680. I cannot find any way in the world to think of that as anything less than TOTALLY STUPID.
Just to see whether this is a complete anomaly I decided to check another flight. What about flying through the other hub in Minneapolis? Round-trip from DLH-MSP is $399. If I keep flying from MSP and travel on to St. Louis my cost drops to $249. That's right, I save $150 by taking another seat on another flight and eating more lousy pretzels and being sneered at by more disgruntled employees. Still, that's nothing compared to the $441 I save by flying on to Flint rather than staying in Detroit.
Airline pricing has never made perfect sense, but they seem to be reaching an all-time high in stupidity. BTW, I try to teach my children not to use the word "stupid," but I just can't help myself when I can't find another word without sacrificing accuracy.