Is anyone familiar with how cabin/fare classes align between the Delta/KLM/Air France partners? For example, I'm looking at a trans-atlantic flight (AF3581) on the Air France site, which is operated by Delta. The Air France site has "Economy" tickets at half the price as the same flight's lowest fares on the Delta site, but I'm not clear which fare class I would actually be buying.
Delta's site shows 4 options available for this flight (Airbus A330-300):
Economy (main cabin)
But for this same flight on the Air France site, only 2 options are available:
Would booking this flight from the Air France site be buying Delta's Basic Economy (no seat assignment or upgrades allowed), or main cabin Economy seat (standard options allowed)?