Originally Posted by
ACflyerDE
You can try and "upgrade" in the lounge or at the gate in ZRH by explaining that you bought a Business Class fare but for whatever reason were booked in Economy on the ZRH-FRA flight. If they have space available in the J cabin you have a decent chance that they will do it.
What is your success rate doing this? They rebook you in J even if the fare requires P? Or they just do some kind of shenanigan at the gate? How does this work?