
FlightAware
RadarBox
ADSBExchange
ADSB Hub
Plane Finder
VariFlight
FlightRadar24
The OpenSky Network is a non-profit ADS-B exchange for sharing real time aircraft data broadcast over the airwaves. The network consists of thousands of sensors connected to the Internet by volunteers which collect ADS-B and Mode S broadcast data.

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Which is more popular?
Based on our record, OpenSky Network seems to be more popular. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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OpenSky Network helps urban planning by showing flight paths and their impacts. It improves aviation safety by analyzing near-miss incidents. Insurance companies can verify flight claims with real-time data. It also...
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Recommendations tracked on public social media and blogs since March 2021.


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... Source: about 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: about 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... Source: about 5 years ago
Tracking Opalstack since Sep 2023.
When comparing OpenSky Network and Opalstack, you can also consider the following products.


Real-time flight tracking app with one of the best and most accurate coverage worldwide.
Compare RadarBox to OpenSky Network or Opalstack:

The world’s largest co-op of ADS-B/Mode S/MLAT feeders, and the world’s largest public source of unfiltered flight data. Access to worldwide flight tracking data for hobbyists, researchers, and journalists alike.
Compare ADSBExchange to OpenSky Network or Opalstack:
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.
Compare ADSB Hub to OpenSky Network or Opalstack:
Plane Finder is built on Automatic Dependent Surveillance – Broadcast (ADS-B) enabling the transmission of real-time data directly from, and to, aircraft.
Compare Plane Finder to OpenSky Network or Opalstack:

VariFlight is a live flight tracking service that allows you to have real-time information about flights worldwide.
Compare VariFlight to OpenSky Network or Opalstack: