Writing formed in the sky by smoke released from an airplane

• Message from heaven?
• Message made by pilots
• Messages created by planes

WordNet Word definitions in WordNet
n. writing formed in the sky by smoke released from an airplane

Wiktionary Word definitions in Wiktionary
n. Messages, left by leaving a trail of smoke from an airplane, that are visible from the ground.

Wikipedia Word definitions in Wikipedia
'''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, ...