Where to apply for an airport transit visa?

My place of residence My visa application should be submitted to
Andhra Pradesh, Andaman and Nicobar Islands, Arunachal Pradesh, Assam, Bihar, Chandigarh, Chhattisgarh, Daman and Diu, Dadra and Nagar Haveli, Delhi, Goa, Gujarat, Haryana, Himachal Pradesh, Jammu and Kashmir, Jharkhand, Karnataka, Kerala, Lakshwadeep(UT), Maharashtra, Madhya Pradesh, Manipur, Mizoram, Meghalaya, Nagaland, Odisha, Puducherry and Tamil Nadu, Punjab, Rajasthan, Sikkim, Tripura, Uttarakhand, Uttar Pradesh, West Bengal

The Embassy of Switzerland in New Delhi via 

VFS Global Services Pvt. Ltd.

Representation agreement

If a State does not have its proper visa section in a country or region, the delivery of a Schengen visa can be delegated to another Schengen State member with an agreement between both countries concerned.

The agreement allows the appointed representation to represent and handle Schengen visa applications within its own competence without consulting the other represented State.

Country / Region Schengen State which represents Switzerland My visa application should be submitted to
Bhutan  Austria  VFS Global Services Desk for Austria