I would suggest you read this thread:
Hour building in US...You need a Visa !
I too saw the IFTA Website and at first it looked very attractive. After doing my homework, it seems that IFTA is the only school with this information and it is the exact opposite of what the U.S. Embassy in London told me.
You might want to start your homework by giving the U.S. Embassy a jingle at 0207 499 9000.
TTF