skysign

A skysign is a form of advertising or display that is visible in the sky. Historically, this was most commonly achieved through the use of skywriting, which involves aircraft releasing smoke to form words or images. Another method is banner towing, where an aircraft pulls a large banner with a message or advertisement.

The practice of skywriting gained popularity in the early 20th century. Aircraft, typically modified for the purpose, would fly in specific patterns to create legible messages. These displays were often used for product launches, promotions, and even public announcements. The smoke used was generally a non-toxic oil that vaporized upon release.

Banner towing is a more recent development, becoming more prevalent in the latter half of the 20th century and into the 21st. This method allows for larger and more varied messages, as the banners can be pre-printed. They are typically flown at lower altitudes than skywriting, making them more easily readable from the ground.

Both skysign methods are subject to regulations regarding airspace usage, safety, and environmental impact. The visual impact of skysigns is significant, making them a notable, albeit temporary, form of outdoor advertising. While less common than static billboards or digital displays, skysigns continue to be employed for their unique ability to capture attention through their aerial presence.