Originally Posted by cfischer
Schengen is the term for a multilateral agreement on waiving passport and border controls between countries of the EU. There are only controls at the Schengen borders, e.g. in AMS when coming from NYC. If you fly FRA-AMS, there is no passport control in AMS. For IST-CDG this is not relevant; as a special bonus of CDG airport you will have to go through passport control and security again anyway, since you have to leave the 'secure' area to change terminals
. Your luggage will be checked through, that's no problem.
For IST-CDG-JFK, this is only true if you choose to go landside. If you take the airside bus from 2E to 2C or 2F2, then you only go through security again, not passport control (although you may have to show your passport & boarding pass to go through security). Anyway, it's a realatively painless procedure either way, except for long lines at peak periods. But I can't ever remember waiting more than 5-10 minutes either way, which is much better than waiting times for security at ATL, JFK or LAX during peak periods. I've heard horror stories about CDG Terminal One, but T2 has always been very fast and efficient for me.