The decree includes international and domestic flights.
Domestic flights could still change and start earlier depending on us doing our part not to contract or spread the virus in the meantime.
International flights, well first and foremost, that is not an Argentine issue to solve or influence. Other countries need to get their health situations under control before these can even be considered.
My attempt at futurology would take a reference from what Australia, New Zealand and Singapore are planning on implementing in the next 4-5 months - a "travel bubble" - where these countries would be open to one another but closed to the rest of the world since these countries have a similar situation/plan and measures in place to suppress the virus.
Could imagine a "travel bubble" with Uruguay and other similar countries, but Brazil and US will almost certainly be off-limits until around the end of the year or longer. Europe not until September at least when their borders will re-open (despite the scientific community saying this is already too optimistic.) and many in Asia are applying selective entry policies (e.g. banning anyone who has been in risk zones recently and/ or nationals of risk zones.)