Originally Posted by
Zach1213
Is it truly immigration, or a passport check to make sure you have the proper documentation for your next flight (which is common)? I have not transited in Madrid but will on Sunday going non-Schengen to non-Schengen (DFW-MAD-RAK), so this intrigues me.
You will not get a passport check. The case I responded to was a special case for IB metal to LHR and DUB which has a separate area that you can't get to without entering Schengen.