Did you read Sugarlites original post? plus all the subsequent ones.
Getting him to give any information about what plane he said he seen is like pulling teeth.
I am well aware of the many multiple conditions that need to be before forming a contrail, which is why i ignored it completely.
Contrails have been arround since the early days of flight and are frankly no more intersting than a HQ holden making water in its exhaust at idle
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