The carrier dragged down shares of other airlines, sending the Dow Jones US Airlines index down 2.6 percent.
Advancing issues outnumbered declining ones on the NYSE by a 1.73-to-1 ratio; on Nasdaq, a 1.17-to-1 ratio favored advancers.
The S&P 500 posted 38 new 52-week highs and no new lows; the Nasdaq Composite recorded 99 new highs and 17 new lows.
