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

AAR Corp. Common Stock (symbol: AIR) was one of the worst losers of the
trading day today (2016-12-22), losing -8.97%. The number of shares that
changed hands was 727,504, or about 3 times the average daily volume in the
stock.
The closing price was $34.19, amounting to a market cap of $1,160,000,000,
about -11.77% off the highest price in the last 12 months. The stock has
been trading at a range between $18.36 and $38.75.
AIR is in the Aerospace industry, part of the Capital Goods sector.
Looking at its valuation, the stock is now trading at 34.61 times earnings.