This is merely my own hypothesis of course, these lines in the sky carry labels neither up in the sky nor when we find them on NASA Worldview. The latter is no way conclusive, my guesstimate is its only a fifth of probably happens in reality; its merely that Worldview is a snapshot of a certain time of day, my guess is late morning towards noon local and … its all I’ve got!
Looking back a few days as part of my intermittent chemtrail diary theres certainly solid information we can set down here. Incidentally here in north east England yesterday 6th September mid evening at sunset we had a huge criss-cross chemtrail practically overhead and the initial northern chemtrail as it approached was quite horrific in its proportions, full blast and lots of it, perspective and viewpoint of course adding to the effect. No other human being apparently latches on to what is plainly visible and this judging from the near zero reaction my chemtrail blogging inspires.
Denmark, Copenhagen, Aarhus chemtrail/ whitening the sky Sept 4th 2021 …. https://go.nasa.gov/2X3QGTa

Same location next day, wow this is chemtrail …. https://go.nasa.gov/3zUugSD
As above, over in the Baltic ie chemtrail … a two hundred mile chemtrail … https://go.nasa.gov/3BME4i8
Link for image below, chemtrails over the Baltic 5th Sept 2021 …https://go.nasa.gov/2WZFFBY

Below, chemtrail over Baltic 7th September 2021 … https://go.nasa.gov/3zRUcyn

In the above, chemtrail extends to three hundred miles.
Below, chemtrail over Holland, hint: try the other filters, its a lot of chemtrail. Chemtrail 7th Sept 2021 over Holland … https://go.nasa.gov/3jRvcBR

Here is a more distinct image of the above chemtrail shenanigans over Holland … https://go.nasa.gov/3DOhjw2
And if we alter the selectable filter to Suomi/NPP we get the following chemtrail soup over Holland ie … https://go.nasa.gov/3BUO5dj
Same day its probable chemtrail over the Balearics and extending though Spain.
Here we are chemtrail south east England, English Channel, northern France 6th Sept 2021 … https://go.nasa.gov/3hdsm8p
Heres an interesting little group of chemtrail west of the Channel Islands and north of Brittany 6th Sept 2021 … https://go.nasa.gov/3BRjiy0

postscript, to add to the above.
chemtrail northern France, Channel Islands, southern England 11th Sept 2021 … https://go.nasa.gov/3AfeH8e

Next day and day after yes Worldview captures chemtrail, for instance for 13th Sept chemtrail northern France … https://go.nasa.gov/3nBdV1Y
Choosing another filter for Sept 13th we obtain chemtrail for Ipswich, Margate, Antwerp, Rotterdam … https://go.nasa.gov/2YXWT3U
Chemtrail 12th Sept 2021, heres chemtrail over the English Channel, Portsmouth, Isle of Wight … https://go.nasa.gov/39eZnMV
Chemtrail over North Sea, eastern England, Lincolnshire, Norfolk, 12th Sept 2021 … https://go.nasa.gov/2XqhQE8
Going back to 11th Sept we find east coast England targeted for chemtrail, for instance chemtrail Lincolnshire and east coast England … https://go.nasa.gov/3hujnjp
Hint, change filter settings on the lh panel, can help with finding chemtrail.