I hadn't been aware that Buenos Aires had three passenger airports. Learn something new every day. That 55 km would likely take a while with traffic? (I have to Google Earth this and see where each airport is via-a-vis the city core and each other.) This reminds me of Paris, New York, London, and Moscow which have multiple passenger airports and where not all of them accept international flights.
In looking at B.A. on Google Earth (with the airport overlay), there are three airports; EZE looks to be the one to the southwest of the city core, there's a second airport (which I assume to be "AEP") to the northwest of the city core, and there's a lot of urban development between the two airports; in addition, there is a third airport in the city core on the shoreline. (And on Google Earth if you get close in enough you can see passenger jets on the tarmac.)
Anyhow, I would guess that if the teams arrive in the evening and can't fly out until morning, then the travel time to go between airports shouldn't matter for getting the flights to Salta.