The large order from Turkish Airlines is a significant positive development for Airbus, indicating strong demand for its aircraft, which should be beneficial for the company's revenue and future growth prospects. However, the stock price decline on the day of the announcement may be due to broader market conditions or profit-taking, and does not necessarily reflect the long-term impact of the deal. The advanced talks with Atos over the cybersecurity division could also be seen as a strategic move to strengthen Airbus's position in the cybersecurity market.