A nationwide “anti-austerity” strike is taking place in Argentina. This strike has grounded flights and brought grain ports to a standstill. Major transportation systems, schools, banks, and other public services are closed as the strike takes place. The economic crisis in Argentina has meant rapid inflation, accompanied by job losses. Unions representing public sector workers are demanding that the country increase wages in order to keep up with inflation.
See "Argentina strike shuts down key grain ports, grounds flights", Nicolás Misculin, Reuters, May 29, 2019