Originally Posted by HappyLanding
I got this about 8 hours before departure. Does it mean no seat reservation is possible using the commonly used reservation systems at this time?
Correct.
Originally Posted by HappyLanding
We used web check-in to select a seat. I found that the seat selection was not visible on Amadeus' checkmytrip.com.
Does it mean data put directly into the airlines system are not updated back to the "GDS" reservation systems? Or is it just because of the "closed" status?
The airline wouldn't allow anyone to pre-reserve seats any longer, as PAX were already checking-in for that flight.
Originally Posted by HappyLanding
Does DCS really stand for Departure Control System? Can someone confirm this?
Yes.
Originally Posted by HappyLanding
Furthermore: The reply says "USE >4.....". Does it mean with a different command (if we had direct access to the dialogue session) we could still see seat maps?
Most likely.