I am luckily now holding my eTix The online-team could not overcome the MCT issue, but the on-site day team of my TA asked me if I am sure, I agreed that operating carrier does not guarantee my connecting flight (which is indeed same aircraft I came in!). The option to buy DUS-ZRH-CDG and one CDG-ZRH-DUS would have been some 100€s more expensive, so I am lucky now with one tix!

Btw: is it allowed, undertaken you already have your BP for CDG-ZRH, to not leave the plane at all - or is it because cleaning, re-fuling etc not allowed / not possible at all? This would make me feel more comfortable I am not tied up with long queueing at security...??