The ongoing strike by Boeing Co. (NYSE:BA) machinists has dealt a severe blow to the aerospace giant, with estimated costs reaching nearly $5 billion as the labor dispute enters its second month. What Happened: Sunday marked 30 days since 33,000 members of the International Association of Machinists walked off the job on Sept. 13, bringing production at the troubled aircraft manufacturer to a near standstill. According to an estimate by Anderson Economic Group, as reported by CNN, the estimated cost of the strike is nearly $5 billion. The prolonged work stoppage has taken a toll on Boeing’s fi…