Skywriting
（重定向自Skywrote）
Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns that create writing readable by someone on the ground. The message is often a frivolous phrase, a generally meaningless greeting, or an advertisement aimed at everyone in the vicinity, a general public display of celebration or goodwill, or a personal message, such as a marriage proposal or birthday wish.