I coudn't resist posting these. It was Good Friday, so someone had the idea of putting the Easter message in the sky. In a couple of the photos you can make out the aircraft (a Cessna?) making the trails.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/58613084@N02">Andrew Thomas</a> from Shrewsbury, UK
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/atom-uk/14363544093/">Sky-writing over Brisbane, April 19 2014.</a>