Keep in mind that you only need to apply for a Switzerland airport transit visa if your final destination is a non-Schengen country. If you are travelling to a Schengen country, you need a regular C-type Schengen visa.
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For a stopover in the United States or a stay of less than 90 days : It is not necessary to apply for a transit visa. You can simply apply for an Electronic Travel Authorization issued by the United States. To obtain your certificate in a few minutes click on the online form.
With direct airside transiting, as you will not be deemed to have entered the UK, you will not need permission to enter the UK for this type of journey. However, as a visa national, you may still need a Direct Airside Transit visa (DATV) for an airside layover. Not all visa nationals are required to apply for a DATV.
Indian passport holders are not obliged to hold an Airport Transit Visa. Hence, transit through Switzerland and stay at the airport international transit area is permitted without any visa. Please note that Switzerland Tourism has no authority related to granting or declining a visa.