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What do CTA and CTD mean?
CTA - no arrival possible
Once a "CTA" (closed to arrival) - closed for arrival, is set for a day, the guest can not book this day as a day of arrival. If he arrives before this day and remains beyond this day this is possible.
CTD - no departure possible
As soon as a "CTD" (closed to departure) - closed for departures, is set for one day, the guest can not book this day as a departure day. If he leaves before or later than this day, this is possible.