Iridium NEXT satellites have ADS-B receivers.[0] Also, Spire Global, with a network of cubesats, have ADS-B receivers in their sats already. [1][2] I proposed

Iridium NEXT satellites have ADS-B receivers.[0] Also, Spire Global, with a network of cubesats, have ADS-B receivers in their sats already. [1][2] I proposed something similar a few years ago, using cubesats to track airliners, but it didn't go anywhere because Spire Global was already working on that. [0] https://aireon.com/resources/overview-materials/iridium-next/ https://aireon.com/resources/overview-materials/iridium-next... [1] https://www.spire.com/en/company/news/2019/03/spire-s-first-ads-b-plane-tracking-satellites-to-enter-service-by-the-end-of-q3 https://www.spire.com/en/company/news/2019/03/spire-s-first-... [2] https://www.satellitetoday.com/mobility/2018/10/03/spire-global-indmex-aviation-partner-to-develop-aviation-surveillance-solutions/ https://www.satellitetoday.com/mobility/2018/10/03/spire-glo...