1) Airmail 1) Message from heaven 2) Occupation in aviation 3) Writing 4) Writing implement 
Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns to create writing readable by someone on the ground. The message is often a frivolous or generally meaningless greeting or phrase, an advertisement aimed at everyone in the vicinity, a general public display of celebration or ...
[n] - writing formed in the sky by smoke released from an airplane
noun writing formed in the sky by smoke released from an airplane