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I see there is a hole located below the 2nd or 3rd window. What is its purpose?

enter image description here
(Sources: flickr.com and planespotters.net)

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  • $\begingroup$ Thanks for editing! It's a kind of duplicate, but I haven't managed to find that answer and even if I had found it, I wouldn't have been able to match it with my question $\endgroup$
    – RomanG
    Mar 12, 2018 at 11:32
  • $\begingroup$ You're welcome. I understand it's not always easy finding the related post, that's why I pointed it out. After pointing it out, did it answer the question? It's happened before. Note that accepting the proposed duplicate does not delete your question. A duplicate is not a bad thing, your post can serve as a sign-post. Each plane has those static ports, so you can imagine the question repeating itself. $\endgroup$
    – user14897
    Mar 12, 2018 at 12:19

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Static ports. (capt & FO).

For sensing static (atmospheric) pressure ultimately used by various flight instruments (such as airspeed indicator, altimeter, etc.)

enter image description here
(Source: b737.org.uk)

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