Where can I find the cheapest flight from Miami to Bangkok, Thailand only stopping in New York and using Thai

Where can I find the cheapest flight from Miami to Bangkok, Thailand only stopping in New York and using Thai?
International Airways directly from New York to Bangkok. Miami to New York can be used on any airline. I have a travel agent telling us it is about 1800.00 per person and I checked expedia, cheaptickets, Thai Airways directly and can't find it any cheaper. Help The dates are in December (Christmas time)
Thailand - 3 Answers
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1 :
your not going to find a cheaper flight going on Thai Airways direct. the cost is about $1600 round trip. you need to try another airlines but your not going to find one going non stop like Thai Airways.
2 :
try all those again and www.cheapflights.com but fly on xmas day it's a lot cheaper or fly virgin to london and then thai to bkk,cost you no more than $1500 you americans pay far too much for air travel,maybe it's because you don't travel abroad much?Is it true only 10% of yanks have passports?
3 :
Have a look on www.staralliance.com. Thai are part of Star Alliance. The American carriers in that alliance are US Air. Perhaps you could fly Miami-Charlotte-New York? (Charlotte being US Air's main eastern hub). Using the "alliance" should produce a cheaper fare than using a different airline. Alternatively why not fly to the west coast from Miami,and then use the Thai Airways LAX-Bangkok flight? The New-York-Bangkok non-stop is one loooooong flight! The time you plan to travel is also certainly not the best if you're looking for "cheap" flights.