The news in Argentina is actually not all that bad. For the record:
are all alive, although not that well.
Impossible to go direct (the flight would be around 6 hours!), so go via AEP
(Buenos Aires). From IGR to BA
it's straight forward:
Aerolineas Argentinas/Austral B732/M81/M83
American Falcon B732
Southern Winds - LAFSA B732
Buenos Aires to USH
Aerolineas Argentinas A313 (via FTE on the outbound, direct on return)
Aerolineas Argentinas/Austral B732/M83/M88 (3 choices: via Trelew, via RGL, or direct)
American Falcon/LAER F28 (via CRD, FTE)
American Falcon is operating on an erratic schedule at present, so double check when they are operating their services.
Aerolineas Argentinas/Austral maintains high frequency to both IGR and USH
year round, with a minimum of 5 flights a day.
Aerolineas Argentinas/Austral service has improved dramatically, and the airline is modernising. 2 of their 5 oldest 732s will be retired by the end of the month, and nearly all the rest of the fleet is of '80s-build.