OpenSky Network
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Cachely.dev
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Cachely is the managed self-hosted remote cache for Nx and Turborepo - the cache backend you'd otherwise build and run yourself, hosted for you on Cloudflare's edge (R2). It's a drop-in replacement for a DIY @nx/s3-cache / S3 bucket setup: point your build tool at Cachely with a token and two environment variables, and share build cache across CI and every developer's laptop.
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OpenSky Network
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What about opensky-network.org? Their API is free if you are a feeder. I use Node-RED to get the exact information you mention. Not sure what programming language you are going to use, but if I can get it working in Node-RED as a non-programmer, you should have it up and running in just a few minutes. Source: almost 5 years ago
You may try https://opensky-network.org/, they have a good historical data for aircrafts. Might be something you can find for the airports as well. Source: almost 5 years ago
I haven't thought much about this actually. I wouldn't know how to do something interesting with monitoring/streaming/retraining because as you say, it looks like you would need a proper production setting; that said, there are some interesting open source streaming data sources out there, I recently saw some open live data for flights around the world for example (I think it's this one). Source: about 5 years ago
Flightradar24 filters out a lot of data. ie: military flights. You should look into using opensky-network.org. Source: about 5 years ago
FlightAware - Live Flight Tracking
nxCloud - nxCloud is a commercial OwnCloud provider
RadarBox - Real-time flight tracking app with one of the best and most accurate coverage worldwide.
ADSBExchange - The worldโs largest co-op of ADS-B/Mode S/MLAT feeders, and the worldโs largest public source of unfiltered flight data. Access to worldwide flight tracking data for hobbyists, researchers, and journalists alike.
ADSB Hub - The main goal of ADSBHub is to become a ADS-B data sharing centre and valuable data source for all enthusiasts and professionals interested in development of ADS-B related software.
Plane Finder - Plane Finder is built on Automatic Dependent Surveillance โ Broadcast (ADS-B) enabling the transmission of real-time data directly from, and to, aircraft.