American Airlines 777-223ER, N778AN, (c/n 29587/223) scheduled to arrive at Buenos Aires Ezeiza (EZE) from Miami (MIA) on 14Jul14 diverted to Mendoza (MDZ) due to fog at EZE and also at the usual alternate airports of Montevideo (MVD) and Cordoba (COR). Even Rosario (ROS), which would be a possible alternate was fogged in.
As a result, the 777-200 diverted to Mendoza (MDZ) some 700 miles (1120km) due west of Buenos Aires along the Andes mountains near the Chilean border. The aircraft arrived at MDZ at 09:57am and did not depart until 12:31am of 15Jul14 finally arriving at EZE at 1:15am. The long delay was presumably due to flight crew rest regulations.
Photo of N778AZ at Mendoza (MDZ) (scroll down):