What's This? (Question About 737-900ER)

In the picture below, you will see something looking similar to an extra door. I thought it was a door, until seeing a seat map on SeatGuru and Delta that had no such door marked. Does anyone know what it is?
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Credit to:
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There are two doors in the picture. The one closer to the wing of the aircraft is just an emergency exit, the one at the back is for ground servicing (such as food catering) I think.

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It’s not marked

http://www.delta.com/content/www/en_US/traveling-with-us/airports-and-aircraft/Aircraft/boeing-737-900er-739.html

http://www.seatguru.com/airlines/Delta_Airlines/Delta_Airlines_Boeing_737-900ER.php

http://www.seatguru.com/airlines/United_Airlines/United_Airlines_Boeing_737-900_A.php

Why does no one have it marked?

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There’s an outline of sorts below the winglet in this perspective, I think in some versions there is an emergency exit there but the outlines there if the exits there or not… I think

Can you find one with an exit there?

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image

This is all I could find. Got it from one of the links you gave above. Still doesn’t answer about what is supposedly a door.

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Lion 737-900
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It isn’t necessary on two class 739s and wastes space (i.e. United and Delta 739)

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Huh, that’s so odd! Didn’t know that it does and doesn’t exist depending on the plane!

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I might be wrong but It looks like a secondary emergency exit. Some are not marked as emergency exits as they are secondary and not used first unless the others cannot be accessed.
Zara I said I might be wrong and I am not sure about this but I think it could be.

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It’s only used on certain aircraft and if it would be there I think it would be marked

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Maybe your right. As I say often, I am a professional pilot on a PC12 and C208 so I am not familiar with that kind of commercial aircraft. @Winner580

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