Things are looking rosy! Considering a year ago we were all rather wondering whether BBD would survive the tariffs Boeing lobbied for, here we all are anxiously wondering what Delta's cabin config will be, and it's called the A220.
Presumably now that Delta's is beginning to fly, they're going to get a good handle on just what it can do for them, see if the numbers are what BBD / Airbus said. If so, they're probably looking forward to some sort of price advantage in the ticket selling business, which must be giving their marketing people a happy feeling of anticipation. It has to be dead easy to sell tickets if you can undercut the opposition without denting net revenue, especially as there's a prospect that passenger feedback will be good too.