To answer the original question, Go! is still there, and still charge super-low fares. I believe they are losing money hand-over-fist, and am not sure what the business plan is...
- Drive Hawaiin or Aloha out of business?
- JO might think Go! could be an effective tool to use against the mesa pilots for their contract negotiations...since it's a money-loser, JO could suddenly shut it down at a key time and scare the junior pilots into giving concessions.