Punishment is the idiot's (non) solution.
Performance from a 2,000 M runway will take a few minutes tops. Flight planning for an airfield 9 nm distant can be done on the back of a fag packet. The loadsheet from the initial departure will show no limits will be broken and depending on its format, may even spit out the trim setting, if required. So what next? Backtrack - set up - brief - blast off. Next?
The big issue is the treatment of the crew. Which numbskull will tell me how sacking them will fix the problem? The problem was that it for some reason this crew believed they were at the correct airport. When that had been answered, you then set about fixing the problem. Sacking people sends only sends the message that if you ever screw up you will be punished. And then your problems as a company really start. Because from then on, the management will be running a totally safe airline. There will be no reports, no ASRs, CVRs will be "erased", FDM recorders "disabled", etc. Furthermore, your aircraft might now be flown to inefficiently that you might find the company's existance is in jeopardy. In addition nobody will own up to anything, just in case what they have done will be perceived as a mistake. The result will eventually be a totally shocking smoking hole in the ground. One that could have been prevented if only they knew they had a problem.
Punishment of people who were trying to do the right thing is a halfwitted, myopic, ill-considered course of action taken by stupid, ignorant bullies.
PM