This column does bring back memories of many more cities that were once hubs:
AA at BNA, RDU, and SJC
DL at CVG and MEM (MEM previously NW and even RC-Republic before that). PDX was a small hub with flights across the Pacific.
NW had a mini-hub at BIL
TW at MCI. Also had small hubs at ABQ and PIT at the start of deregulation.
CO at ELP.
US at DAY and SYR (previously PI, and Empire at SYR before that).
HP (America West) at CMH.
YX (Midwest Express) at MKE.
QQ (Reno Air) at RNO.
Some very large commuter hubs also existed in the 1980's and 1990's:
Air Midwest at MCI.
Big Sky at BIL.
CommutAir at ALB.
GP Express at GSO (during the short Continental Lite era of the mid-90's)
Mesa at ABQ.
Please feel free to add to this list!
Don't forget Air Midwest's hub and headquarters at ICT. For years, they had crew scheduling if not more there after it stopped flying under its own code. Always wished I could have flown them as a kid, but they were generally too expensive for my family to use for travel within the region.
The Dayton hub was Originally piedmont and was surprisingly very successful, until USAir and their problematic labor relations came along. along with Syracuse.
USAir built up IND as a hub for many years, but let that go when they acquired Piedmont. Even earlier, they had tried STL.
Ozark and Midway both tried to build Philly, but failed. Republic also built up PHX into a hub after the Hughes acquisition.
Midwest Express had a really nice operation at MKE, later trying to build a second hub at MCI before settling on Omaha.
MCI had at various times Branniff, Branniff II, TWA, Eastern, Vanguard, USAir, and Midwest Express all trying to build hubs or focus city operations. Midway II did well at RDU until 9/11 hit. Even Greensboro has been tried a few times, by CO Lite, Metrojet, and later Eastwind.
Orlando has been tried several times, most notably by Delta, and before that, Florida Express. An FLL hub has been tried numerous times by many different carriers over the years. All eventually failed, until JetBlue and Spirit came along. Same for San Juan
Farther west you had Texas Intl and Muse at MSY. Reno at RNO, and later SJC. Horizon tried building BOI at one point.