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Timatic, the databse which airlines use to verify passenger travel documents, explains what transit without visa means:
Transit Without Visa (TWOV): Passing through an international transit area of the airport in order to board a connecting (or to proceed by the same) flight, without entering the country (i.e. clearing immigration).
Unless stated otherwise, passengers wishing to TWOV must:
- be en-route to a third country (e.g. itinerary TYO-LON-TYO is not considered TWOV);
It doesn't count as transit without visa if your connecting flight returns to the same country as you departed.
The airline staff will treat your itinerary as though you are entering Kuwait and will apply the visa rules that Timatic gives for Swiss passport holders entering Kuwait.
Visa required, except for Nationals of Switzerland can obtain a visa on arrival for a maximum stay of 3 months. They can apply to extend their stay.
This means the airline won't deny you boarding, except possibly in some corner cases: For instance, Kuwait requires you to depart by the end of the day before your passport expiry date. Or they might deny boarding if you didn't actually have a return ticket.