Between October 2023 and January 2024, T2RL, in collaboration with industry expert Timothy O'Neil-Dunne, conducted several interviews predominantly with Travel Seller organisations with the intention to better understand how a varied range of key players in the Travel Seller community views the current changes to our industry. With this report we aim to record valuable lessons learnt from the experiences so far and to positively influence the NDC roll outs and improvements under way. We also seek insights to help shape the transition to OOSD (Offer, Order, Settle, Deliver) which is in its early stages. By acknowledging and understanding some of the missteps made with NDC with the benefit of hindsight, and the challenges still faced by the airlines, Travel Sellers and their technology partners today, we hope to influence a better path for OOSD transformation.