The Double Helix is a different board construction. Here is what the CI website says about it:
"This is the first release from our Skunkworks research and development program. Not to be confused with graphite rail boards you’ve seen on the market, the Double Helix offers a unique three dimensional helliptical rail wrap. During the designing and testing process we found that completely enclosing the rail in a secret blend of micro-synthetic fibers added strength and gave the board a fast and springy feel. Stringerless construction, epoxy layup and a special blend of polyurethane foam, these boards are a true extension of your feet."
As far as the Flyer goes they still have them and you can still order them. Here is the description from the CI Website:
A worldwide favorite, this design excels in small to medium surf but still rides and responds like a conventional shortboard. Al considers this the best small wave shortboard he has ever designed. It should be ridden 2” to 3” shorter and 1/4” to 1/2” wider than your normal shortboard. We can build the Flyer up to 7’6” for you big guys.
Also available as a Quad.