You’d think that this was a cut and dry topic, but it’s far from it. What flights should count? Non-stop only? Contiguous countries? Territories and dependencies (they do often have the same currency and government as their mother country)?? As a result we’ve had to categorize the list a bit. We’ll start with a little background: the IATA (International Air Transport Association) defines “domestic” as two places with the same ISO country code. Contrary to the IATA definition, however, the regular passenger considers domestic flights as those where they do not need to pass immigration on departure and arrival.
Longest non-stop domestic [...]