The Middle by bdunn02

Question 6

Well it winds from Chicago to L.A., more than 2,000 miles all the way. In the route specified in Nat King Cole's rendition of the song Route 66 and excluding mentions of Chicago and L.A., which two cities are at the middle of the song's geographically-ordered list?

Gallup, N.M.; Flagstaff, Ariz.