A commercial airport being any airport that has regular scheduled passenger flights.

The mathematics of this question got me thinking: is the network of scheduled flights a connected graph?

That is, is there a pair (or triplet or even larger set) of airports such that they only have scheduled flights with each other? Or can you get from any airport to any other?

Ignore vagaries like cargo and general aviation. I'm looking for two airports that I can shuttle between, but would have to drive (or sail) to get to one or the other of them.

closed as off-topic by Karlson, Jan, Giorgio, Doc, choster Nov 1 '16 at 22:16

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    Is this really travel related? Seems more appropriate for aviation.SE... – Roddy of the Frozen Peas Nov 1 '16 at 20:03
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    The graph theory term you're looking for is connected. – Nate Eldredge Nov 1 '16 at 20:11
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    I'm voting to close this question as off-topic because it belongs to aviation.SE. – Karlson Nov 1 '16 at 20:16
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    Before someone wastes his time on checking out the OpenFlights database - while it does turn up 23 isolated city pairs, none of them are actually valid flights (either outdated or invalid data) – JonathanReez Nov 1 '16 at 21:07
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    @Karlson The fact that a question is on-topic elsewhere does not mean it is off-topic here. By the same logic as you show, they could argue -- at av.se -- that it does not belong there and should go here. – yo' Nov 1 '16 at 21:13

Here's one such pair of airports:

Westerly State Airport (Rhode Island) and Block Island (Rhode Island)

There are frequent scheduled flights between the two airports, and neither seems to offer scheduled flights anywhere else at this time.

  • Wouldn't the New York Seaplane Base count? – JonathanReez Nov 1 '16 at 21:17
  • @JonathanReez There are no flights to the New York Seaplane Base base now. There may have been some during the summer. – Zach Lipton Nov 1 '16 at 21:18
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    still, those are scheduled flights, even if they are seasonal – JonathanReez Nov 1 '16 at 21:20
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    Specifically, it looks like Tropic Ocean Airways operated at least some weekend flights to Block Island during this past summer, but they've since gone down to Florida. There are no flights scheduled from New York to Block Island at this time. Maybe they'll come back next summer, but they don't have a schedule, won't let you book such a flight, and packed up and moved their operation 1,000 miles south, so I don't think they count right now. – Zach Lipton Nov 1 '16 at 21:22
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    @Malvolio Mostly searching for some variants of "island shuttle flights," since I figured those would have a better chance of quickly satisfying the criteria. – Zach Lipton Nov 1 '16 at 21:24

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