Bulgaria, Croatia, Cyprus, Ireland, Romania and the United Kingdom are EU states that are not, or not yet, part of the Schengen area. This means that a flight from one of these states to a Schengen state is regarded as an external flight and is subject to border checks.
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Schengen member states are Austria, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden and Switzerland.
Do US Citizens Need a Visa for Switzerland? US citizens do not need a visa to enter Switzerland, as long as their stay does not exceed 90 days in any 180-day period, for purposes such as tourism, business, short term studies, cultural or sports events, or medical treatment.