It has been about a month since the last earnings report for Landstar System (LSTR) . Shares have lost about 2% in that time frame, underperforming the S&P 500.Will the recent negative trend continue leading up to its next earnings release, or is Landstar due for a breakout? Before we dive into how investors and analysts have reacted as of late, let's take a quick look at its most recent earnings report in order to get a better handle on the important drivers.How Have Estimates Been Moving Since Then?It tur ...