advisory committee to the Postmaster General, formed in 1957 to recommend new <#poststamp=postage stamp> issues.

see <#chinaclay=China Clay Paper>.

generic name for the planes flown by Pan American on its trans-oceanic routes.  See also <#chinaclip=China Clipper>.

closed bags of international mail that pass through an intermediate country without being opened.

the time after which mail will no longer be accepted by a local post office for dispatch by a specific train or ship.  See <#supplementary=Supplementary Mail>.