Searches run on your own key, so the usage is yours. It is stored against your Google account only.

1. Go to rapidapi.com and sign up (free).
2. Search for AeroDataBox and open that API.
3. Press Subscribe to Test and pick a plan — the free tier is enough to try it.
4. Open the Endpoints tab and find the header X-RapidAPI-Key.
5. Copy that value and paste it here.

Tip: set a hard usage limit in RapidAPI so you can never be charged unexpectedly.