There are several reasons that contrails can become extended. There are also reasons that the contrails will converge, overlap, dip, etc. It is all in the atmosphere and how the upper air winds are blowing as well as how the vortices created by the aircraft interact with the condensation created.
You will also notice these contrails more at this time of year because the air is clearer and dryer.
Google, aircraft contrails and the crow instability effect.
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