I have a 6:30 AM flight from Naples. What is a reasonable way to get to airport from Pompei? The train is not operating yet.
For such an early flight, I don't think you will have many options and will have to rely on a cab. The alternative is to spend the night in Naples rather than near Pompeii - even then, you will probably still have to take a cab to the airport.
You are about 45-50 minutes away from the airport if you stay in Pompei. The taxi or private shuttle is the only transportation that will get you there on time.