Considering 30-days investment horizon, GOL Linhas A is expected to under-perform the SkyWest. In addition to that, GOL Linhas is 1.39 times more volatile than SkyWest Inc.. It trades about -0.32 of its total potential returns per unit of risk. SkyWest Inc. is currently generating about -0.27 per unit of volatility. If you would invest 892 in SkyWest Inc. on April 26, 2012 and sell it today you would lose (143.00) from holding SkyWest Inc. or give up 16.03% of portfolio value over 30 days.
Diversification
Modest diversification
Overlapping area represents amount of risk that can be diversified away by holding GOL Linhas A and SkyWest Inc. in the same portfolio (assuming nothing else is changed)