Striking aviation workers forced LATAM Airlines to ground flights out of Buenos Aires’ Ezeiza Airport on Tuesday. The workers, who belong to Argentina’s Union of Commercial Airline Senior and Professional Personnel (UPSA), walked out over stalled pay negotiations. In a separate dispute, 12 days ago Argentina’s government ordered pilots from the Argentine unit of Chile-headquartered LATAM back to work and for wage talks to resume. LATAM operates TAM in Brazil and LAN Airlines in Chile, Argentina, Ecuador, Peru and Colombia. LAN Argentina’s domestic flights were not affected by Tuesday’s strike.