Brazilian carrier TAM has started operating a Boeing 767 on its Rio De Janeiro to London Heathrow route.
The aircraft is the first of six B767s that the carrier plans to integrate into its fleet by November.
Each jet will carry 221 passengers - 30 in business with fully-flat seats and 191 in economy.
Damian Scokin, vice president of LATAM Airlines Group international business unit, said: "We remain committed to constantly improving the travel experience for our customers and ensuring that TAM Airlines holds its own in the face of its competitors.
"The introduction of the new Boeing 767 to TAM's fleet means that we can offer business class passengers more comfort with full flat seats, a wider range of entertainment options for everyone, as well as reducing the impact of aviation on the environment."