How to apply for my transit request?

In your reply to the question no 2 you have stated that: "You can put forward your request for transit to your airline in advance, so that the airline can declare this to the Immigration Inspection prior to your visit." Do I understand it correctly that while in the plane (landing at one of the airports allowing for 72 hrs transit) I will fill out some kind of card/request which I will hand over to the flight attendant? Can you please clarify "in advance" in your reply to the question no 2. Regards, Slavka