In the lead-up to earnings, Boeing (NYSE:BA) has been cruising at a level altitude. Boeing stock has stayed rangebound, barely straying from between $175 and$200 per share. Still, it’s very possible that the current performance of shares in this aerospace giant is merely the calm before storm.Turbulence may soon return for this stock. Yes, BA has already fallen by more than 30% since the start of the year, but don’t assume this fully considers its current issues. Boeing’s earnings release may raise concern ...