Flightradar24's fleet page opened in a new tab. Select and copy the registration list there, then paste it below — one per line or however it copies, doesn't matter.
For a plane the game's added that isn't in the tracker yet. Fill in every field exactly as the game shows it — sorting, grouping, and rarity coloring all depend on these matching the existing conventions.
For an airport missing from the community-mirrored data. Continent must match one of the existing groupings so it slots into the right place in the browsing tree and map.
For an airline the game tracks that isn't in the tracker yet. Country is free text with the existing ones suggested — type a country that isn't listed and it becomes a new group in the browsing tree automatically.
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Needed for Currently Airborne to work — without it, live tracking has nothing to authenticate with. Free to create at opensky-network.org → My OpenSky → API Client. Each account should use its own — this is never shared with the other account.