OK, I'm also about to high dive into my first ZED experience after having many many 'back up plan' ID90s in the past. Going over, I'm fairly confident about my CDG-SPU even though it's Croatia Airlines flight and so far no takers on checking loads (it's a happy face though on FlyZed). On the return, I need to have a bunch of back up plans into different airports and will either take a direct flight or may have to transfer through Zagreb (or another city). I want to have the following back ups for the return:

9/27: IB3861 DBV-MAD (direct)
9/27: B2883 DBV-LGW (direct)
9/28: OU651 SPU-ZAG, ZAG-AMS OU450

QUESTION: Do I 're use' the same tickets/passes even though they are on different days, different airports and different carriers? I think I need to have at least 3 segments for a possible stop. Do I buy one 3 segment and one direct and 'reuse' these?

QUESTION: Should I be really worried about relying on FlyZed for availability? For the OU flights, that's all I've got.

Thank you all!

seatomypants