Madame and I wanted to go to Buenos Aires for the December Holidays, but given the situation we might just postpone it till mid-2021. I monitor AF prices on the CDG-EZE route from time to time, and they have not changed much from the pre-Covid era -- between 700-1200 euros for a return ticket. Lots of Flying Blue availability in Economy. Business seems more restricted.

I'd be careful with booking hotels, in Argentina and elsewhere. For the last months I have been seeing great rates for late 2020/early 2021 that looked more like desperate appeals for funding rather than an actual engagement to host you next year. Unless the rate was so cheap I'd not mind losing the money if they went out of business, I'd stick to major chains where possible.