Originally Posted by
injera
following up - around 9pm last night i noticed flights were at $164 which I promptly purchased. They're now back to $178. Both last night and now are in the 'X' bucket.
I guess I had always assumed "X tickets cost $XXX, L tickets cost $XXXX, etc..." clearly i'm wrong.
DL can offer multiple X or whatever fares simultaneously. Some might have longer advanced purchase requirements, require particular times or routes, etc., even though they book into the same inventory class.