While I'm saddened by the way JetsGo ceased operations, remember that this was mainly done by the executives at a very high level and chances are 0% of airport workers knew what was happening until they got a call saying "go home" and hence why tickets continued to be sold, etc.
For some very good reading if you're interested in aviation, read about the Dallas-based Braniff International ceasing their operations in May 1982 at
http://www.braniffinternational.org/...finalhours.htm