bonjour, est il possible d ecouter les conversation avion/tour
I think it is possible, not sure it is allowed, probably depends on the legislation in you country. But is not really a topic on this website, this is more about tracking flights, at least in my experience.
Check out liveatc.net for listening to ATC.
Listening with your own receiver is really hard to disallow.
(some countries still do which is ridiculous)
As you can see on liveatc: It is prohibited to publish recordings of ATC or broadcast ATC in some countries.
Another vote for https://www.liveatc.net/
Works on Pi: