Once a very diverse aviation scene in South America is now strongly dominated by two megacarriers - Avianca and LATAM. Luckily at least Avianca pays tribute by its retro colours to smaller airlines they swallowed in the past, in this case TACA from El Salvador.
Avianca, the second oldest airline in the world, celebrated 100 years of existence in 2019 and for this reason applied retro colours from the 1960s to this A320.