I browsing on AC's website for YVR-EZE fares which shows as follows (o/w based on choosing return dates)
Tango $2349++
Tango Plus: no fares loaded
Latitude: no fares loaded
Executive lowest: $2254++
Executive flexible: $5029++
Not tool long ago I was getting approx $1000 all-in return on Tango Plus for this route for a MR that gave me approx 15k miles. Looks like above are inaccurate fares and some sort of issue with AC uploading them.....
cheers.