Hi everyone, long time lurker with a few posts scattered here and there. I apologize if this has been posted already, but I was unable to find it anywhere.

I just booked an open-jaw BNA > DTW > AMS > CDG then PRG > AMS > DTW > BNA.

When selecting seats to buy into Economy Comfort, I found that if I selected EC seats on the first international leg, I could actually close out the payment prompt window and continue on with seat selection, eventually only paying for one international leg upgrade.

Obviously, if I tried to change EC seats on the first leg I would be prompted for payment, but it never tried to charge me to keep the seats I had, and even my itinerary on Delta's site showed proper seating.

I finally called Delta to verify that I wasn't missing something (because it's never spelled out that it's per leg so one could probably think that if they were purchasing both legs they just wound up with a cheaper overall price).

The rep let me know that those seat assignments obviously wouldn't be valid (which was fine because I want those seats and expected to pay for them) and that I merely needed to swap EC seats, pay the fees, then log back in and pick the seats I wanted again.

He DID say that when he pulled up my PNR it was showing those earlier seat assignments, so who knows what would have happened at the airport.

I just thought I would make everyone aware. I'm sure people that have flown EC have ran into this already, but I know there are still people that are looking at booking into this in the future and might benefit from the explanation of what's actually going on.

I feel like the website should catch this and force you to pay for all legs you selected EC on at the end of the seat selection, but that's probably too much to ask considering everything else the site should be able to do but can't (I'm looking at you award ticket change).