Hello, I'm about to book a trip in coach on AF. I see on SeatGuru that the selection of seats I have starts on row 18, or TEMPO fares. Is this the premium equivalent on CO, or do I need to call AF and ask for premium seats as a CO Plat? Or does CO Plat not get the same advantage on AF?

FYI, for my trip, I wanted to book on CO of course, but my itinerary (IAH-CDG-MIL-FLR-CDG-IAH) costs over 2K on CO, and only ~$740.00 on AF. What's up with that?