AeroVironment, Inc. (NASDAQ:AVAV) shares are trading lower after the company reported its fourth-quarter financial results and issued guidance below estimates Wednesday. Here's a look at the key figures from the report.  The Details: AeroVironment reported quarterly earnings of 43 cents per share, which beat the analyst consensus estimate of 21 cents by 104.76%. Quarterly sales clocked in at $196.98 million, which beat the analyst consensus estimate of $188.56 million by 4.46% and represents a 5.88% increase over sales of $186.04 million from the same period last year. AV said revenues reflect higher product sales of $23.1 million, partially ...