Update for USA passport holders - I received a generic letter from the embassy, which I responded saying Thai immigration wants personalized letters - I haven't received an actual letter yet, but I received this e-mail from the embassy today: Thai Immigration requires foreign travelers to request an extension letter from their respective embassies. If you are unable to return to the U.S. and require a visa extension letter, please scan a copy of the biodata page of your passport and send to [acsbkk@state.gov](mailto:acsbkk@state.gov). Please ensure that your name, picture, and passport number are clearly readable. Due to the volume of requests please allow up to 72 hours for a copy of your extension letter. Every effort is being made to issue them as soon as possible.
TLDR : Answer Summary
USA passport holders facing challenges in returning to the U.S. can now request a personalized visa extension letter from the U.S. embassy in Thailand. They need to send a scanned copy of their passport's biodata page to the embassy, allowing up to 72 hours to receive their extension letter.