This is a measure to help the airline industry adapt to the change. March 26 is the date of the switch from the winter schedule to the summer schedule for airl

This is a measure to help the airline industry adapt to the change. March 26 is the date of the switch from the winter schedule to the summer schedule for airlines. There are differing rules and visas for entry into Croatia versus Schengen, and changes on the ground like different gate assignments, and given the timing of the final decision (Dec 9th, midway through the winter schedule) it would have meant that airlines would be speculatively changing the rules on their flights mid year, which is obviously unworkable.