Which feature is unique to Ryanair's booking process?

The feature unique to Ryanair's booking process is the option to add insurance during the purchase. This aspect is particularly aligned with Ryanair's business model, which is focused on providing low-cost flights while offering various add-ons to enhance the travel experience. During the booking process, customers are given the choice to include travel insurance, which can be an important consideration for travelers looking for added peace of mind when booking their flights.

Other airlines might have similar options, but Ryanair puts a strong emphasis on these upsell opportunities as part of their low-cost model, which encourages customers to enhance their purchase experience by opting for additional services. This stands in contrast to the other options, which may be found in various forms among different airlines and do not define the uniqueness of Ryanair's booking approach.