Basic Economy Hack (international)
I found a good fare from JFK to Europe $600 (basic economy) on Delta metal... that same ticket is bookable on AirFrance (about $12 more, obviously wayyyy less than the approximately $150 "main cabin" upgrade on delta). If I book through Air France I can select seats right away - and DM Line stated I would be eligible for C+ at checkin.
Is there a downside I'm missing?