But the UA aircraft also has 26 BC seats, which are like standard domestic FC. 12 FC + 26 BC is much greater than CO's either 16 BF or 24 FC or 12 FC (753). Domestic FC is really BC. Plus the UA coach is all E+.

CO's 753 competes more in the class of SONG, ATA, and some other discounters. But JetBlue has better seat pitch. Plus many of the discount airlines have FC, like Spirit, AirTran, etc. Spirit has 16 FC seats on an MD-80, more than CO had when it used the MD-80's.