The use of airfreight by Stellantis to overcome supply chain disruptions is a proactive measure that may reassure investors about the company's operational resilience. However, the impact on the stock is likely neutral in the short term as the company has managed to prevent any significant manufacturing impact. The investment in sodium-ion battery technology through Tiamat reflects Stellantis's commitment to sustainability and innovation, which could be viewed positively by investors. However, the recent drop in share price suggests that the market may have reacted negatively to the news of the Red Sea disruptions or other external factors.