I am travelling to Vienna from New Delhi on a Turkish airline flight and returning from Rome to New Delhi on Air India Flight.
My itinerary is New Delhi-Vienna-Zurich-Rome- New Delhi. I have a Schengen visa valid for my entire stay in Europe
My questions are:
Would there be a problem like denied boarding or restricted boarding considering following points.
I do not have a consolidated Passenger Name Record (PNR). My outbound ticket from New Delhi to Vienna and my return ticket from Rome to New Delhi are on two different PNR as they have been booked as one way tickets.
I am travelling from Vienna to Zurich through Rail and from Zurich to Rome through Iberia Airlines (also booked as one way ticket)
Do I have to go through any other immigration after entering Vienna for my onward travel to Zurich and Rome. If yes, would they also need proof of entry and exit for that ?
My Turkish airline flight from Delhi to Vienna has a stopover in Istanbul, where I have to change planes. Do I need a transit visa for Istanbul in that case ?