> And the second is that you're not the one flying the plane. You thought you were going to Charles de Gaulle but the weather in Paris is worse than expected or some drunk driver crashed the gate and drove out onto the runway and they're diverting all the planes, so after you're already in the air you find out you're actually going to Heathrow.

Such a system would presumably account for possible diversions and plot your flight accordingly.

And yes, that is a thing that some of us do actually need. For example, while I have lived in the West for the past 18 years, I'm still a Russian citizen, and if I ever set foot there again they will likely have some questions for me regarding all the money for the war effort in Ukraine (see Ksenia Karelina for an example). Thus I would very much appreciate the ability to book a flight that is guaranteed to not be diverted to Russia or to any country that is likely to extradite to Russia, and I would pay money for such a service.

> Such a system would presumably account for possible diversions and plot your flight accordingly.

I mean, that's fine if you want to avoid Russia while flying from California to Quebec, but you don't really need an app for that one. Whereas if you're within the plane's fuel supply of where you don't want to be, how are you supposed to know ahead of time what kind of nonsense is going to happen while you're in the air?

The plane could have a navigation failure over the ocean and end up arbitrarily far off course. Some first class VIP could have a medical problem which is going to force the plane to divert anyway and then the nearest city with the right kind of hospital is in the place you don't want to be. And what if you end up St. Petersberg not because you had a layover in Finland but because Helsinki was your intended destination?