EOBT 12.00
SLOT 13.17
Pax in the terminal are informed about the atc restriction.
at 11.45 New slot time arrives: 13.09, in any case boarding was planned to begin at 11.50.
At 12.10 all pax - 2 are sitted, and the slot is again changed to 12.32.
in many airports you should be ready to go at slot - 20 min. in this case at 12.12.
you have 2 minutes to find the 2 happy shopper or to unload their bags.
In this case "who removed that slot????", i will shout
hope this helps to some people some other point of view.