Thailand has been downgraded to Category 2 by the FAA.
ICAO and the FAA appear to have finally had their fill of the corruption, incompetence and accident rate "overseen" by the Thai Department of Civil aviation. First ICAO censured Thailand, and now the US FAA has downgraded the country's aviation to match that of most of Africa.
What this means: US passengers will be warned that aviation on Thai-based airlines is unsafe. Bookings will be impacted. More significantly, Thai-based airlines in the US will not be able to expand or alter their schedule or equipment in the US unless their rating is returned to Category 1. (The US FAA tends to review a country every 5-10 years.)
We, SLF, thank the pprune community for your support. These safety findings and the limitations they put on the expansion efforts of Thai-based operators would not have been possible without you.
Information:
The crash and aftermath of Orient Thai's One-Two-Go
ICAO Red Flags Thailand June 2015
The FAA Downgrades Thailand December 2015
Also you can search pprune for Orient Thai & One-Two-Go to read of a single (tiny) carrier's history of crashes and near misses.