All city Ships I have seen in the notes or have come up with:
NYC×Boston
NYC×Philadelphia
NYC×LA
NYC×Trenton, NJ
Boston×Philly
Philly×Pittsburgh
Seattle×Portland
Seattle×Vancouver
Portland×San Francisco
Spokane×Portland
LA×San Francisco
LA×Pheonix
Dallas×Houston
Louisville×Cincinnati
Montreal×Toronto
Edmonton×Calgary
Austin×Detroit
Austin×Nashville
Honolulu×Anchorage
Orlando×San Diego
Chicago×Baltimore
Rio De Janero × Hong Kong
Chicago Selfcest (North side×South side)
STL×Chicago
STL×Kansas City
Chicago×Gary
Salt Lake City×Ogden
DC×Baltimore
Wichita×Tulsa
Nashville×Minneapolis
New Haven×NYC
Boston×Bangor
Pheonix×Las Vegas
Atlanta×Nashville
LA×San Diego
Portland×Vancouver
Hoboken, NJ×Alexandria, VA
Paris×London
Milwaukee×Chicago