CO should not build a hub in DEN, there is too much competition now that F9 has grown into a big animal and UA is dedicated to existing in DEN. Although, if CO needs a Western hub where else is there?

SEA--has AS, only way it would work is if CO has an exstensive codeshare agreement with AS and only opperates long haul flights. AS would bassicly be a CO feeder airline
PDX--has AS, not as big of a market as SEA
SFO--UA, enough written
OAK--WN for domestic, CO does not want to compete against them
SJC--failed for the other Texan carrier, why would it work for CO?
SMF--WN for domestic, not big market
LAX--UA, AA, and DL is expanding, domestic held by WN
BUR/SNA/LGB--slot restrictions and domestic
ONT--too far away from ZLA main traveling points to be a meaningful Western hub, also in terrible connecting position to go to Asia
PHX--HP reincarnated as US, WN, too far south
LAS--see above PHX description
SLC--DL, enough written
GEG--no market
BOI--no market
DEN--UA, F9, WN expanding, too far east
GUM--too far west (east?) for most connecting, needs nonstop flight to mainland
YVR--AC and in Canada, possibly most likely of all possibilities

The next hub in the west will be QX with A380's flying BLI-MWH and trunk routes such as PDX-EUG and ACV-PDX
Mark my electrons, QX WILL happen