Have a look at this picture: 
It's from Airliners.net (though I've modified it a lot) and shows some lines on the fuselage. What are they? Are they Lightning Diverter Strips like in this question ?
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2$\begingroup$ aren't they just edges? $\endgroup$– falstroApr 9, 2016 at 18:53
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1$\begingroup$ Duplicate? Why are these rivets on the 777 so visible? $\endgroup$– minsApr 9, 2016 at 19:26
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2 Answers
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No, they are just the boundaries between skin panels. See below for a picture of the 747-8 fuselage during assembly.
[![Boeing 747-8 front from side[1]](https://i.stack.imgur.com/dhxBD.jpg)
Boeing 747-8 front from side (picture source)
And this is how the panels for the cylindrical section look like before they are joined:
Boeing 747-8 fuselage panels. The original picture (source) is named "wing panel skins", but these are really fuselage parts.
answered Apr 9, 2016 at 19:32
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These lines are skin laps. The vertical ones do not overlap, the horizontal laps overlap by three rows of fasteners.
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$\begingroup$ The downvote wasn't mine but it would probably help if you explained what a "skin lap" is. The asker surely wanted to understand what they are, not just what their name is. $\endgroup$ Aug 23, 2016 at 10:22