Airmail etiquette

An airmail etiquette, often shortened to just etiquette, is a label used to indicate that a letter is to be sent by airmail. The term is from French étiquette "label, sticker" (cognate to stick), from which also comes the English word etiquette "rules of behavior".

Airmail etiquette

An airmail etiquette, often shortened to just etiquette, is a label used to indicate that a letter is to be sent by airmail. The term is from French étiquette "label, sticker" (cognate to stick), from which also comes the English word etiquette "rules of behavior".