 AeroCentury Corp. NYSEAMERICAN:ACY was the recipient of a large increase in short interest in July. As of July 15th, there was short interest totalling 18,700 shares, an increase of 29.0 from the June 30th total of 14,500 shares. Based on an average daily volume of 110,200 shares, the short-interest ratio is currently 0.2 days. Approximately ... 