I've seen some contrails, when the plane was coming right at me, that appeared to be going straight up. There is no way that they could have been,
but that's how they looked. It can really throw you off if you aren't used to it.
I would suggest that you download the following app for your mobile phone. Obviously not all aircraft are covered but it provides the data of height,
speed and flight path. In future it might assist you in working out what you are seeing. Perspective has fooled a lot of people when observing
contrails. Flight Radar also has a playback feature.
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