Edit: Looks like the pics from navsource online are not linking properly.
Edit2: Photos have been replaced-- cannot get any from the navsource.org to hotlink. Sorry!
During World War II, there was a great need to train and qualify naval aviators on carrier takeoff and landing operations, but the Navy needed the carriers they had for combat operations. The solution to this problem was to build 2 training aircraft carriers and run training ops out of Chicago, which had a fairly low enemy submarine threat level.
To avoid having a TL/DR original post, we'll split the initial subject into 3 parts: 1) the ships themselves, 2) training operations, 3) recovery efforts of lost planes.
Part 1- the ships
The USS Wolverine (IX-64) was commissioned on 12 August 1942, converted from a Great Lakes passenger liner originally built in 1913.
The SS Seeandbee, as originally built:
During conversion:
Conversion complete, August 1942:
The USS Sable (IX-81) was commissioned 8 May 1943, after conversion from the steamer SS Great Buffalo.
SS Greater Buffalo before conversion:
After completion:
Sable and Wolverine docked in Chicago:
Further references:
Wikipedia article on USS Wolverine
NavSource Online article, USS Wolverine
Wikipedia article on USS Sable
NavSource Online article, USS Sable