* Air Canada
Replaced the usual 767-300 aircraft on its Toronto (YYZ) - Santiago (SCL) - Buenos Aires Ezeiza (EZE) - Toronto (YYZ) "triangle" route with the 777-300ER for the southern hemisphere "summer" period from October 2015 to March 2016, which resulted in a 65% increase in seating capacity with a total of 349 seats on each flight.
The Canadian airline will once again operate the 777-300ER on the route from 30Oct16 to 24Mar17.
* American Airlines
Operated the 787-8 between Buenos Aires Ezeiza (EZE) and Dallas-Ft. Worth (DFW) for only five months (June - November 2015) and then went back to the 777-200, which it is still flying on the route today.
Started operating the 787-8 on the Buenos Aires Ezeiza (EZE) - Bogota (BOG) route on 01Feb15 but apparently replaced it with the A330-200, with the exception of the 787-8 again for a month from 16Aug15 to 17Sep15. Avianca is currently operating the A330-200 between Argentina and Colombia on a daily basis.
* British Airways
After having reduced the frequency on its London Heathrow (LHR) - Buenos Aires Ezeiza (EZE) route from daily to 5x/weekly on 31Mar15, the carrier returned to daily service operated by 777-200's in November 2015, which it is still flying to this day.
Leased a 747-446, EC-LNA (c/n 26346/897), that it started flying from Caracas (CCS) to Buenos Aires Ezeiza (EZE) 2x/weekly on 01Nov15. It is still flying to Argentina on the same basis.
Upgauged from the 777-200 to the 777-300ER on its daily Dubai (DXB) - Rio de Janeiro Galeao (GIG) - Buenos Aires Ezeiza (EZE) service on 01Sep15, which it still maintains today.
http://www.routesonline.com/news/38/airlineroute/250247/avianca-adds-boeing-787-buenos-aires-sao-paulo-service-in-augsep-2015/ via Eric Trum
http://www.routesonline.com/news/38/airlineroute/251801/conviasa-adds-leased-boeing-747-operation-from-nov-2015/ via Eric Trum