NEW YORK, Oct 28 (Reuters) - U.S. stock index futures added to gains on Thursday after data showed first-time claims for jobless benefits unexpectedly fell last week.
* Futures had firmed steadily heading into the data. S&P 500 futures rose 7.1 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures gained 49 points, and Nasdaq 100 futures were up 9.25 points.