NEW YORK, April 27 (Reuters) - U.S. stocks fell on Monday as concerns that the spreading of a new flu strain could dampen optimism about the economy overshadowed a restructuring of General Motors Corp and gains in biotechnology stocks.
* GM to cut costs, eliminate Pontiac brand; shares rise
* Airlines, oil fall on flu worries
* The Dow Jones industrial average .DJI dropped 51.29 points, or 0.64 percent, to close unofficially at 8,025.00. The Standard & Poor's 500 Index .SPX fell 8.73 points, or 1.01 percent, to 857.50. The Nasdaq Composite Index .IXIC dropped 14.88 points, or 0.88 percent, to 1,679.41. (Reporting by Rodrigo Campos; Editing by Jan Paschal)