The identified problem KLM has, is a knowledge gap between KLM employees in middle and higher management and KLM’s frontline staff (FLS). New ideas or processes are created at KLM’s headquarters by ‘thinkers’, while these new ideas or processes need to be executed and iterated by front live staff, ‘do-ers’. By involving startups in their innovation process, KLM has an neutral third party who helps bridging the gap between idea and implementation: something that startups do everyday by nature: iterate. Currently startups are already embraced within KLM (e.g. challenges, pitching events, demo’s), but after the selection procedure there is no dedicated way of facilitating them for a pilot, collaboration or partnership. Until now, KLM has never organised a test flight where they invite startups to test their products. This research aims to co-design this way of working together with the end-users of the service: cabin crew, startups from the Bay Area and the passenger. By answering the question “How to facilitate these X-Flights best, within KLM’s existing flights?”, a small step is taken towards answering the bigger question: “How can KLM learn from startups to adapt their mind-set?”. solution X-flights is a project from KLM Royal Dutch Airlines, with the aim to facilitate test flights on regular flights real time, with real passengers. The objective of X-Flights is to facilitate both internal as external idea owners, and therefore make testing innovations, either process or product, during dedicated test flights easier and less bureaucratic. The aim of this thesis is to create a way of working for startups, cabin crew and passengers to test during flights and therefore add value to the passengers experience. First, a network of startups in San Francisco was created to invite for the test flight. Then, a baseline research has been done to observe the current way of working how partner airline Air France facilitates startups during test flights at the moment. From the observations and interviews made during this test flight, 4 clusters (Logistics, Communication, User and Timing) were made as a starting point for the next phase. The next step in the design process was to facilitate a 5-day co-design sprint together with a San Francisco-based startups, KLM cabin crew members and passengers. This co-design sprint was facilitated involving 2 X-Flights: from San Francisco to Amsterdam and back. The sprint consists of 5 phases: Align, Ideate, Prototype, Test and Evaluate. Using a framework to assess all criteria made before or during the sprint, conclusions can be drawn on how to facilitate test flights best. This gives KLM an overview of the assumptions, observed current state of facilitating, the desired way of working for all actors and how the tests were going. Finally, giving 7 recommendations for future test flights. Outcomes of the test flights were measured qualitative (Air France test flight) and quantitative (KLM X-Flights). Measuring the outcome focussed on the 4 clusters mentioned before, and for the passenger also on the added value to their experience. Results from the surveys show that passengers see an added value to their customer experience in testing during flights. It also shows that when communication is good to cabin crew and logistics planned well, cabin crew doesn’t experience interference with their regular tasks. The 7 recommendations given for KLM X-Flights in the final visual advice are: 1. Train a KLM Product Genius 2. Test in business class 3 . Sensitize the cabin crew 4. Provide a visual time line 5. Inform the passenger 6. Distribute product pre-flight 7. Collect product end of flight