Creator here. I posted Flight-Viz a few days ago (https://news.ycombinator.com/item?id=47603966) and the feedback was great. Since then I added a cockpit mode that follows any liveflight with real 3D terrain.
How to try it: go to flight-viz.com, click any plane, then click "Cockpit" in the action buttons. You'll get a first-person view wit h real buildings, terrain, atmosphere, and a HUD showing altitude/speed/heading — all driven by live ADS-B data.
This is so cool. But on iOS, clicking the plane flashes the mini modal/popup but the it immediately disappears. There no way, on touch, to keep it open long enough to click a cockpit view button, assuming there is one.
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If you click on a city's name, you can see a list of all flights arriving and departing. Some of the arriving ones will be in flight, and you can click on the flight number to view it, then "Cockpit" view to see (roughly) what the pilots are seeing.