On Friday last I noticed these contrails, something I've only seen once before here. My penthouse faces South, and I live 1km from Port Beach in North Fremantle, so these were headed for Bunbury on the course they were flying. The one on the left was slightly ahead the one on the right as it had disbursed more than the other. I assumed that they may have been the flights to South Africa, but two flights that close together seems odd. Can anyone throw any light on the matter?