I just interned my Mother's remains in Florida. TSA rules are specific - if they can't get a clear x-ray of the urn it can't fly. Not as a carry on NOR as checked luggage. If your urn has any lead in it's makeup (whether it's plastic, ceramic or whatever) it won't go. USPS registered priority service delivered the ashes on time for us. Neither Fed Ex or UPS will ship human remains in any form.