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I'll try, is this just based on opinion? These all fit in my eyes to varying degrees.
Hartford, CT--Springfield, MA
Boston--Cambridge/Worcester, MA
Boston--Providence
NYC--Philadelphia (I'd call em brother cities lol)
NYC--Boston
Philadelphia--Pittsburgh
Pittsburgh--Buffalo
NYC--Chicago
NYC/Chicago--Toronto
Chicago--Detroit
Washington--Baltimore (Washington is clearly the big sister)
NYC--Jersey City
Newark--Jersey City
Boston--San Francisco
Los Angeles--San Diego
Phoenix--Las Vegas
Seattle--Portland
Well, just a buncha obvious ones, and maybe some ones other people might not agree with. I have more but, that'll do for now.
Boston--Portland, ME
Boston--Burlington, VT
New Orleans--Mobile
Detroit--Flint
SLC--Boise
Maybe KC--Omaha and Omaha--Des Moines
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