Dear all: My 90-day non-B is about to expire, can I get a multiple entry or re-entry permit at the airport, fly out and come back in again before the visa expires with another 90 days entry stamp? I remember with a 1-year multiple entry you used to be able to extend to 15 months that way?
TLDR : Answer Summary
The 90-day non-B visa does not allow for an extension through a re-entry permit. Upon exiting and re-entering Thailand, you will receive another 90-day single entry stamp, but this does not extend your initial 90-day allowance. Extensions can only be granted based on employment through the immigration office.