Saab 340 (JA03HC)

Is this a joke shot? The "documents" being delivered look like paper airplanes.

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When I looked for the first time, I was surprised
However, this is a right procedure

It's called a telegram window or telegram door. Originally For passing weather updates to pilots without shutting down. Started in 1920s. You'll see it on aircraft like the Cherokee and some Beechcraft too

Passenger checklist so the captain can calculate the weight. Notice the rust from the windscreen wiper.

Dear Sam
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Dear Paul
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some guys call that the "whiskey door" or "'whiskey hole"...so you can hand the ca his hip flask...

But what is odd....is that the door is wide open..and you just gotta pop up those silly stair thingys.....

Dear Damon
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I was able to know that there was much usage