They were operated mostly on scheduled routes from AEP (Buenos Aires - Aeroparque) to SLA (Salta), home base for the airline where it was first formed in the mid-2000's. One of the reasons for the return of the aircraft was seriously diminished passenger traffic due to the frequent closures of airspace across the center of Argentina (including Buenos Aires) caused by drifting ash from eruptions by the Puyehue volcano in Chile since early June 2011. This problem continues from time-to-time to this day though the volume of ash is considerably smaller than when the eruptions first took place.
Andes' scheduled routes have been taken up by the carrier's MD-80's but the airline's main business is its charter operations.
Photos: Phil Perry