Hi, thank you very much for this answer, I will make sure to check these options.
I guess I jumped to conclusions quite too fast! I had only been able to contact Chalten Travel which, though it seems possible to buy tickets on Plataforma10, have told me that they stop running this route as of April 15th. I got worried that it would be the same for all bus companies, since they have not answered my mails. Still, Taqsa's schedule is pretty limited, and does not work for me as my plane lands in the late afternoon. I will try contacting CalTur again.
Again, thank you