A 55-minute layover at Amsterdam Schiphol (AMS) is "technically" possible because Schiphol is an exceptionally efficient, single-terminal airport, but it is extremely tight and leaves zero room for error. In 2026, if you are connecting from a non-Schengen country (like the US or UK) to a Schengen country (like Italy or Spain), you must clear passport control, which can have long queues even with the airport's automated gates. If your first flight is even 15 minutes late, you will likely miss your connection. For a stress-free experience, a 90-minute layover is the recommended minimum. However, if both of your flights are on the same airline (like KLM) and they sold you the 55-minute ticket, they are responsible for rebooking you if you miss it. To make it work, you should check your "gate" on the Schiphol app as soon as you land and be prepared to move very quickly through the terminal, as it can take 20 minutes just to walk between the far ends of the piers.