A lie since he used credit card points. (Miles vs Cash are similar.) Actual cost, more like $1800.
However, flights to Thailand are about $600 round trip from NYC, if you're not too picky about the day of the week, time, and having a layover in China. So, over three months, that's an extra $200/month, for a total of $1200/month. Still not bad!
My husband and I went to Kenya for $800 each, round trip, with 10 hour layovers in Amsterdam and Paris. If you fly to a dirt-cheap country, you can have some pretty amazing vacations and save more than the few hundred extra dollars you have to spend on airfare to fly somewhere more distant.