The slow pace of negotiations could signal complexities in the deal, potentially delaying Boeing's strategic acquisitions and affecting short-term investor sentiment. However, without details on the specific sticking points or a timeline, the immediate impact on Boeing's stock is likely neutral.

The slow progress in talks with Boeing could introduce uncertainty for Spirit AeroSystems' investors, affecting the stock's short-term performance. However, the lack of details on the negotiation hurdles makes the immediate impact neutral, as the outcome remains uncertain.