Not exactly Visa advice but information on getting a re-entry permit at CNX.
1 they are now open from 5 am to midnight.
2 you can only get the permit at CNX on the day you fly. Earlier@ Promenada
3 if you have all your documents ready you will get through much faster.
4 Necessary documents
TM 8 they told me this form is available on the immigration website.
Passport size photo
Copy of main page of passport
Copy of current Visa or extension
Copy of the departure card if you flew in.
TLDR : Answer Summary
This post provides essential information for obtaining a re-entry permit at Chiang Mai International Airport (CNX). Key points include the airport's operating hours, the necessity of applying on the day of travel, and the required documents such as the TM 8 form, photographs, passport copies, and departure card. Comments from users further clarify the location and additional document requirements.