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I am Bangladeshi, have Portuguese D visa(PhD purpose). Booked a ticket by Qatar Airways Dhaka to Lisbon.The travel itinary is Dhaka - Doha - Barcelona - Lisbon. But in Barcelona I have 6 hours layover and it is mentioned that Qatar airways operated by Vueling. Do I need a transit visa for Spain?
I have tried to contact as many places as possible but still get no response. If it is possible then response please. Thank you!