Applying for a Schengen visa with a dummy ticket is permissible. It's a respectable and valid custom. A dummy ticket is a reserved or simulated airline ticket that contains all the details needed to apply for a Schengen visa, such as the airline name, the flight dates, and the reservation code. Using a dummy airline ticket when applying for a Schengen visa has a number of benefits. One advantage is that, should your application be denied, you won't have to worry about losing money by fulfilling the requirements for a visa. With a simulated flight reservation, you can provide the necessary documentation for future travel plans.
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