Originally Posted by tev9999
Related question: Do air routes ever intentionally follow Interstate highways? I ask because I've flown DTW-HSV-DTW many many times. The route seems to be I-75 south to CVG, right turn along I-71 to SDF, left turn along I-65 into HSV. Reverse for the northbound.
Just my imagination?
No, they don't necessarily follow interstates. Some may, but it isn't designed that way. Most of them are VOR to VOR. (VOR is a type of navigation aid). Most VORs are located in major cities, which may make it seem like they follow highways (which also most often run between major cities).
You can look at your flight's route at
www.flightaware.com . You can view the IFR Enroute Charts ("air highways") at
www.myairplane.com . Both websites are free.