Weird sight

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Hi all. Today I noticed something strange about some planes, namely that they had no condensation trails (contrails). When planes fly through the atmosphere, their motors which release lots of heat behind them create the phenomenon called condensation just like our breathing during a cold day creates the same thing. However in this pic you can see I have captured a plane (it is a small white dot in the sky in the image) that has no condensation trails whatsoever. Does any of you have any idea why the plane has no trail? Could it be because the atmosphere at its altitude was not low enough to create condensation (because we also don't generate condensation while breathing during hot summer days) or is it because there was no humidity in the atmosphere at its altitude? However, other planes did have contrails and they were very long and very persistent. Perhaps those planes were at higher altitudes with lower temperature.