American Airlines spoke several times in its quarterly earnings call about its new Basic Economy fares that it will begin offering shortly.
They say that “basic and premium economy combined” will be worth more than $1 billion in incremental revenue to the airline, that they’ll get 20% of the way there this year and 80% next year. They don’t split up their projections across the two, and they haven’t even begun selling either (let alone retrofitting international widebodies to sell premium economy). But those numbers are insane.