In trading on Thursday, air services shares were relative laggards, down on the day by about 4.1%. Helping drag down the group were shares of China Infrastructure Investment , down about 29.7% and shares of Zipcar off about 3.3% on the day.

Also lagging the market Thursday are precious metals shares, down on the day by about 2.6% as a group, led down by Caledonia Mining (otcbb: CALVF.OB - news - people ) , trading lower by about 6.4% and Silver Standard Resources (nasdaq: SSRI - news - people ) (), trading lower by about 5.5%.

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