$UAL is one of biggest losers #stocks today. read more:

United Continental Holdings (symbol: UAL) was one of the worst losers of
the trading day today (2016-04-21), losing -9.97%. The number of shares
that changed hands was 25,279,294, or about 5 times the average daily
volume in the stock.
The closing price was $52.76, amounting to a market cap of $18,970,000,000,
about -18.77% off the highest price in the last 12 months. The stock has
been trading at a range between $42.17 and $64.95.
UAL is in the Air Freight/Delivery Services industry, part of the
Transportation sector.
Looking at its valuation, the stock is now trading at 2.71 times earnings.