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What does the "O-A" designation mean on a Thai national's entry stamp?

Thai passportO-A visaimmigrationentry stampvisa exemption
Feb 1, 2024
9 months ago
Mike *********
ORIGINAL POSTER
Good afternoon!

Does anyone knows the reason why in the entry stamp, on a Thai national passport holder, is mentioned the letters "O-A"?

As Thai nationals are obviously exempted of Visas to enter in Thailand, why the mention of that type of visa "O-A" as in picture?

SOLVED: O-A mean outgoing automatic door and there's no departure stamp aswell
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TLDR : Answer Summary
The mention of "O-A" on the entry stamp for a Thai national was clarified to mean 'outgoing automatic door,' indicating that the individual likely entered through automated gates. Comments also noted that Thai nationals typically don't need a visa for entry and that the stamp could be related to the type of passport used for entry.
Michael ********
Also visa class is written above as circled, that section below is for admitted until
9 months ago
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Mike *********
ORIGINAL POSTER
@Michael *******
 yes but she's thai will never needed visa to entry Thailand
9 months ago
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Mike *********
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Michael ********
Do they even stamp passports entering now ?

Most airports have automatic gates now for Thai citizens
9 months ago
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Mike *********
ORIGINAL POSTER
@Michael *******
 already now the meaning. The passport wasn't stamped at departure because effectively it was used an automatic door and this is the code to mention the Outgoing Automatic
9 months ago
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Mike *********
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Brandon ************
A Thai national is only exempt if they enter with a Thai passport. I'd say they entered on some other kind of passport, and therefore they're considered whatever nationality passport they used.
9 months ago
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Mike *********
ORIGINAL POSTER
@Brandon ***********
 in this case it's Thai national and this stamp it's in the Thai passport
9 months ago
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Vernon *********
@Mike *********
Surely not! Brandon is always right!!
9 months ago
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Mike *********
ORIGINAL POSTER
@Vernon ********
 surely not what? About the Thai passport? It's effectively a Thai passport... I'm looking at it.
9 months ago
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Brett **********
@Mike *********
 think that was sarcasm as Brandon is normally the Oracle of such things
9 months ago
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Brett **********
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Brandon ************
@Mike *********
 Sounds like a mistake possibly. But I'm only familiar with foreigner passports and stamps, so if there's a Thai reason, I wouldn't know it.
9 months ago
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Brandon ************
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