In March we flew from Miami to Buenos Aires on Avianca. For 2 tickets we paid around 33,000 Pesos (2,000 dollars) less than Aerolineas or any other airline. It involved a stop of a little over an hour in Lima so the total journey was about 11 hours. The seats were fairly spacious for economy class, and had a good sized TV screen with a decent choice of entertainment. There was also a USB port for charging and using appliances. The food was pretty poor. Check-in staff, cabin crew etc. - all excellent. I would certainly use them again.