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Does anyone know where skydemon publish this?
Frans wrote:
Even a lot of non-flying Dutchies drive to Germany as a day trip, in order to refuel, buy stuff, and going out for lunch/dinner.
I grew up doing that the other way around. 
Very well said @boscomantico!
That PPR thing is indeed another main reason. Those who do fly to Switzerland often go to places like Altenrhein or Locarno, which only requires a flightplan, since customs is on-site and the airports have no PPR requirement. Austrian flying schools also fly regularly to Samedan for mountain introduction flights, but that’s also only a matter of FPL (besides mandatory online briefing, which they do as part of the mountain course). The real Swiss GA fields are almost all PPR. Sometimes it’s just calling a prerecorded tape, telling you the airfield is open. But it can also be a real phone call, a message through WhatsApp, online form etc. Each airfield does these things in their own way, making it intransparent and a hassle for pilots from abroad.
boscomantico wrote:
The Dutch fly to Germany a lot to fuel up their airplanes and have lunch at the same time.Absolutely, because everything is cheaper in Germany. Especially restaurants offer way better value for money. It’s also common to fly to Germany during PPL training. Even a lot of non-flying Dutchies drive to Germany as a day trip, in order to refuel, buy stuff, and going out for lunch/dinner.
I think you mean they were flying G on some other country’s papers; the planes themselves can remain (if certified) indefinitely. There is also a large PH-reg non-certified community, for reasons already much discussed…
There are many reasons for basing a foreign reg plane somewhere but they will represent a tiny % of the traffic shown in the screenshot.
The place to look for travel patterns is FR24 or Flightaware. You see a lot of interesting stuff there, not relying on what SD is showing, and what is not seen is just as interesting as what is seen 
OTOH, like the use of SD, this yields selected data too (Mode S).
SD will also have aircraft registrations but I am sure they don’t want to publish that data, even if anonymised, because it would reveal their sales in different countries.
I disagree. When flying in France, and also when checking on FlightRadar occasionally, I feel that a large share of traffic participants are D-registered. Much more so than F-registered in German airspace.
I disagree. I think some of this is due to EASA-wide regulation – there are 4x D-reg aircraft on our small airfield of less than 20 CofA aeroplanes. The hassle of switching to F-Reg is the reason, apparently. There used to be 2xG-reg aswell, but they were forced to change.
Regards, SD..
Frans was being specific about Switzerland. And it’s true. For ULs anyway, but also for certifieds, it is just that extra amount of hassle that deters.
Nothing of that applies for flights to the usual Austrian aerodromes for example, and ones really notices when following FIS on a nice day.
The Dutch fly to Germany a lot to fuel up their airplanes and have lunch at the same time.
Frans wrote:
I’m still wondering how seldom I see German planes visiting Swiss airfields, even though it’s so close. Same for all other neighboring countries
I disagree. When flying in France, and also when checking on FlightRadar occasionally, I feel that a large share of traffic participants are D-registered. Much more so than F-registered in German airspace.
On the other hand, considering NL being a rather small country, I find that a noteworthy share of PH-registered planes can be seen/heard within German airspace. This corresponds to my non-aviation observation that wherever you travel in the world, you will easily meet some travel junkies from the Netherlands there as well – a spirit to be much admired.
boscomantico wrote:
The amount of activity in Czech Republic. Now it is known that there is some healthy GA there, but it still surprises a bit
Not at all surprising, Czech GA traditions date back to 1920s. As Czechoslovakia was a landlocked country, local aviators adopted a motto: “Air is our sea”. In the communist era, Czechoslovakia was the leader in the design and production of sport aircraft among the Warsaw pact countries.
As I said, selling into different countries presents different challenges. This is well known old marketing. I’ve been doing that since 1978…
A number of countries are impenetrable unless you have a local distributor. One would think that in aviation, and particularly with a mail order product like software, one cuts through these cultural aspects, but only to a limited extent. I’ve written about this before.
CZ has a lot of GA. Even I had a flight, c. 1963, in a Morava 200, belonging to the head of the uranium mines, out of LKPM.
