^ "§244 First-Class Mail International, Mail Preparation". ^ "§234 Priority Mail International, Mail Preparation". Airmail priority how to#
^ "International Standard: How to send". It's better to adhere to standards provided by USPS See also This applies to both First Class Mail International and Priority Mail International service. If USPS customers purchases international stamps from self service kiosk or from post office or online, customer must write "AIRMAIL/PAR AVION" on theĪddress side of the letter. Pre-printed airmail etiquettes are no longer produced by the US Post Office. This requirement is often ignored in modern practice since the USPS discontinued international surface mail in 2007 all international mail from the US is now sent via airmail. The United States officially requires international First Class and Priority Mail letters to be marked with "AIRMAIL/PAR AVION". In some countries, such as the United Kingdom, one may simply write "PAR AVION - BY AIR MAIL" on the envelope, even though etiquettes are available free from post offices. 
The airmail etiquette may be omitted if airmail stamps are used on the letter, and in some cases even this is not necessary if a country sends out all its foreign mail by air. Airlines and hotels have also produced etiquettes, some quite attractive.
The usual design is a plain blue oblong, with the phrases "AIR MAIL" and/or "PAR AVION" in white letters. Because the etiquettes are just instructions to postal clerks, and have no monetary value, their printing and distribution need not be as carefully controlled as for postage stamps, and most are privately produced.
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