This is the email I received from who'm I purchased some infinity car speakers. He has now shipped them regular ground mail.The Post called me today and said that they could not "ship the item by air mail.Supposedly you have to get a declairation from the speaker manufacturer that the Magnets on the speakers will not affect the navigational system of the aircraft or something like that. I have a big long memo that explains it all. Anyway they said that unless I want to call the manufacturer and get all that crap they won't ship them by way of air mail."