Does Registered Airmail come with your regular (post office) delivery, or does it arrive separately, later?
I might add that not all Registered Mail flies. Not all airports accept registered mail. I am in a metropolitan area of about 1 million people and our airport does not accept registered mail. If it is going to fly we send it by truck to another airport about 200 miles away that does accept registered mail. Some of it may go surface all the way. So depending on where it is going to and coming from it may take longer than regular air mail. But when it is delivered it will come with your regular mail and will require a signature. Hope this helps, email if you have more questions.