The term Flyover States doesn’t refer to a neatly defined, clearly demarcated geographic zone. It’s not like Pacific Northwest or Gulf Coast states—two examples of regions that are based on relationships to bodies of water. It doesn’t have a directional basis, like Mid–Atlantic or Northeast, or even Midwest. Sure, there’s a general sense of the where (ummm, it’s somewhere between the East and West Coasts), but there exists no formal definition of Flyover States. Well, the beauty of that means I get to generate my own personal definition.
So, where are MY Flyover States located? See the map below—it encompasses states considered to be part of the Midwest, the Plains, the Great Lakes. It’s where people don’t, generally, speak with well known accents like the Southern accent1 (though, to be sure, the Minnesotans I’ve met do pronounce creek as crick, even though the word should be spoken with a long “e”.)
1In my part of the Flyover States (Indiana), one does hear southern-esque accents, an artifact of the Upland Southerners who migrated and took jobs in the auto industry.