The Commencement Bay class was based on the Sangamon class. These used merchant hulls. There were 35 ships ordered with only 19 completed during World War II and eight afterwards.
The Commencement Bay class escort aircraft carriers could carry a lot more oil.
The rear elevator was positioned more forward than the other escort aircraft carrier classes. There were two elevators in the flight deck.
There were two catapults.
The estimated cost to construct a Commencement Bay class escort aircraft carrier was $11 million each.