Originally Posted by
canadiancow
If it's being booked on AC, the options are:
Basic (what you expect)
Standard (formerly Tango, reduced mileage earning, no free seat selection, etc.)
Flex ("regular" economy)
Comfort (unsure if it's offered on international, but some benefits like preferred seats, etc.)
Latitude (full Y/B)
Be mindful of which brand you buy, as they all have different perks.
note that AC standard (and maybe basic - I’ve never tried it) will give you free seats together if you are traveling on the same reservation with a child - believe it’s for a kid 12 and under.