Back in the 80s and early 90s, Thai had a much larger presence/more frequent service. If my memory serves me, they started their N American service with BKK-NRT-SEA-LAX, then they started serving LAX directly and added service to D/FW and (I think) Toronto through Seattle. I was living in Dallas when they stopped their service there. I still remember how odd it seemed to see the Thai Orchid at D/FW.
"The two most common elements in the universe are Hydrogen and stupidity"