@Brandon ***********
No but it shows sites such as UK.GOV and US state department which state 6 months validity.
Entry requirements - Thailand travel advice - GOV.UK
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Why roll the dice when the airline concerned may refuse to allow check in or the immigration officer on arrival may refuse entry. He might get away with it but then again he might not and lose money paid for tickets and accommodation.
Airlines can be fined for bringing in passengers without the correct documents and it's possible that they have set 6 months in their system to be on the safe side.