What happens if I do not book all my tickets together – what are my passenger rights in such cases?
If you do not buy all your flights in the same ticket you are not covered by the airlines obligations to secure that you reach your final destination in case of delays.
If you for instance buy a ticket to London in one booking and a second ticket from London to your destination in another booking and your flight to London is delayed and you miss your connecting flight, you will most likely lose the ticket and have to buy a new one from London. In this case you would not only lose the ticket from London, but also the return to London if you bought this.
You should also be aware that you cannot check your luggage all the way through or get boarding passes for all flights if you have separate tickets. Consequently you have to pick up your luggage at your transit point, go through customs and check-in once again. All in all, a very time consuming process.