Waves of Updates
Also, they appear to be making updates in waves. I've seen the following occur separately for an August trip:
1) Seating configuration changed for new A330 config but NO seat reassignments (leaving some seat assignments to non-existent seats). Noticed this this morning as per the A330 thread.
2) Schedule updates. Same trip had updated flight times. Actually occurred while I was updating seating selections.
3) Seating reassignments. Yes... even though I had ALREADY updated my seats, DL IT decides to do it again (must have been in queue from before with no validation rule check immediately before update - bad coding).
Fortunately - I've learned to keep checking when it comes to these updates. I'd advise all others to not only check but also to recheck.