Which type would be purchased by british airways to create an online booking system?

British Airways would likely purchase a robust and scalable software solution designed for online booking systems, such as a comprehensive airline reservation system. This type of system typically includes features for flight search, seat selection, payment processing, and customer account management. Additionally, they might consider integrating an API-based solution for real-time updates and third-party service integration. Ultimately, the choice would depend on their specific business requirements and technical infrastructure.