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Jun 4, 2007 | 6:45 am

#19

Xyzzy

FlyerTalk Evangelist

Join Date: Sep 2002

Location: Between AUS, EWR, and YTO In a little twisty maze of airline seats, all alike.. but I wanna go home with the armadillo

Programs: CO, NW, & UA forum moderator emeritus. Eurobonus Millionaire

Posts: 38,725

I've heard this before, but I am a student of urban history

It is a collection of large urban areas that adjoin each other. The best overall definition I've seen, along with some history on it, is here.