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The entire picture is covered, there is not a single natural occuring cloud in that photo. You see 3-4 plane lines

The rest is the smog and total sky coverage behind it.

If this were a time lapse you would see blue sky, then one, two, three jets. Four, five, six jets. Dispersal. Coverage 7 8 9 etc before noon hundreds have flown by in grid like pattern chasing the sun and the day is shot.

Also I swear I can see some of these flights that seem like one will come in mark a point then others will hit that point. Or you’ll see a big trail just making a huge bank, then 10 mins later you would think it’s the same jet like clock work making it’s way around one big circle.