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NEW YORK, Sept 21 (Reuters) - U.S. stocks ended near flat on Tuesday after a broad sell-off the day before, with worries over caution ahead of Wednesday's Federal Reserve policy news keeping a lid on the market.

Trading was choppy, with the Dow and S&P 500 erasing session gains just before the close, while the Nasdaq finished slightly higher.

Shares of Walt Disney Co fell 4.2% and were the biggest drag on both the S&P 500 and Dow after Chief Executive Officer Bob Chapek said the resurgence of the Delta variant of the coronavirus was delaying production of some of its titles.

Investors are waiting for the end of this week's Fed meeting that may shed light on when its massive purchase of government debt will begin to ease.

Officials will reveal new projections as investors also are on alert for any timing on rate tightening.

The Dow Jones Industrial Average fell 50.63 points, or 0.15%, to 33,919.84, the S&P 500 lost 3.54 points, or 0.08%, to 4,354.19 and the Nasdaq Composite added 32.50 points, or 0.22%, to 14,746.40.

S&P 500 industrials led losses among sectors.

Adding to late-day bearishness, shares of American Airlines Group Inc and JetBlue Airways Corp fell after records in Boston federal court showed the United States and several U.S. states on Tuesday filed an antitrust lawsuit against the companies. American Airlines ended down 2.8% while JetBlue fell 4.8%.

The S&P 500 index traded below its 50-day moving average, its first major breach in more than six months. The average has served as a floor for the index this year.

Analysts say a breach of the index's 200-day moving average may now be in sight.

Advancing issues outnumbered declining ones on the NYSE by a 1.32-to-1 ratio; on Nasdaq, a 1.35-to-1 ratio favored advancers.

The S&P 500 posted no new 52-week highs and six new lows; the Nasdaq Composite recorded 41 new highs and 98 new lows.

Volume on U.S. exchanges was 9.73 billion shares, compared with the 9.95 billion average for the full session over the last 20 trading days.