Of all the airports that receive regular commercial flights (airports that serve only military or general aviation flights (private, charter, corporate, etc.) do not count, but airports that serve primarily those interests but do have some regular commercial traffic do), which airport receives the fewest flights per day or otherwise experiences the lowest rate of commercial traffic? Major hubs can receive hundreds of flights per day - are there airports out there that regularly receive only one regularly-scheduled commercial flight per week? Per month? Per year? Per decade?
Even airports that make it onto lists of the world's "smallest" airports tend to receive at least a few flights a week - I'm more interested in the airports where getting to the airport on a commercial flight is possible, but extremely difficult to schedule. So, something like "Well, there's this remote fishing village in northern Nunavut [link]. Most people get there by charter flight and/or dogsled, but Air Canada runs a standard commercial flight every five years, the next one is on January 10, 2025. There are no other regular services." would be a great answer.