I think i have figured out the problem for people who are having trouble with USD fares.

for some reason, IE was blocking cookies from travelocity.com. Because of this, the fare module for USD was not working. As soon as i unblocked the cookies, it started to work.
You can check if the cookie is being blocked by going to travelocity.com and if you see a small eye-stop sign icon in the bottom right of the browser means it is being blocked.

hope this helps for whoever was having this problem.

-gaurav