special delivery

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A method of delivery once offered by the United States Postal Service in which, for an additional charge, a piece of mail was delivered by a special messenger rather than by scheduled delivery.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable A kind of postal service in which, for an extra fee, letters and packages are delivered in a highly expedited manner by a special courier.
• noun countable A particular posted letter or package which is delivered in this manner; a particular act of conveying such letters or packages to one or more recipients.
• noun countable and uncountable, idiomatic, by extension Something—whether desirable or undesirable—which is intentionally given to a specific individual or which an individual receives rapidly and unexpectedly; the personalized, direct quality of the transmission of such an item.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun mail that is delivered by a special carrier (for an additional charge)