Originally Posted by
Seattle1
1. If I don't check in luggage and just bring a cabin bag on board, would I need to go out and go through immigration and security again? Or can I just move from one terminal to another? What is the airport like at Istanbul? The connecting time is about 2-3 hours.
I believe the airside transit facility only works for TK arrivals (and even then probably not from SIN). You will definitely go through security but I don't see a reason why you'd need to clear immigration unless you can't do OLCI for TK (in that case you'd likely need to access TK check-in). In all other cases, just follow transfer signs.
2. If I do check in luggage (one piece), what are the chances of asking them to do an interline transfer so I don't need to collect the luggage and check in again?
This is somewhat random. Does your trip originate at SIN or an outstation?