T2RL has been tracking the travel distribution aggregator market since 2021. The initial review included a small sample of aggregators and each year this data has improved with more being included. In the past the aggregators which have been providing content that could not be easily sourced through the GDSs have been the most successful. With airlines now aiming to offer additional content through NDC including offers/bundles and dynamic pricing, as well as some airlines placing surcharges on NDC GDS content it will be interesting to see how this market evolves.