We flew to Brisbane with a 6 mo old and back when she was 1 yr. It was basically fine but just really, really hard work. The hardest thing is keeping a baby quiet when all the other passengers are trying to sleep. I found the daytime sections easier because if she was tired, dd would sleep anyway, but when she was awake there were plenty of faces to look at and no one minded her noise.
Being able to breastfeed her for take off and landing made life incredibly easy and I didn't have to worry about sterlising equipment, taking formula through security etc. However, would highly recommend requesting a seat that means you won't be breastfeeding with baby's head sticking out into the aisle! by the window and with your partner next to you is infinitely more preferable. Even though I loved breastfeeding and feel 100% happy to have been able to do it, I did feel self-conscious about other people having different views in such a public place - sorry to hear a negative observation expressed so casually about that, Sarah, because that's the kind of comment that sticks in the mind and will stop someone feeling comfortable about just getting on with what they want to do.
Individual nappy change kits were also a life saver - a single nappy sack with a nappy in it plus trial size (if you can get it, or decant into a small pot) nappy cream, a handful of wipes in a small sandwich bag and a disposable change mat you can lie over the change table - that gives you something very portable to take into the loo for changing. There is NO space and dd aged 1yr delighted in pulling all the tissues out of the dispenser while I had both hands busy changing her and holding her onto the table.
Take a rug or blanket that you can lie down on the floor in front of your feet (assuming you have seats with the bassinet and therefore leg room). This means that baby can sit on the floor and play with toys and you don't have to worry about how dirty it might be. We created a barricade to the aisle with our legs so that she had a little rugrat space. She loved pulling toys / books out of the magazine holder and putting them in again. A blanket to go over the bassinet is also essential if your baby is sensitive to light and your bassinet is near the loos or the lights go on just when you don't want them too.
Don't assume the bassinet will work even if you get one... ours was so high on the wall my partner had to climb on the seat in order to lower our baby in without waking her. If she woke on the way in, that was it until we could settle her to sleep again - this happened many times! But still worth booking for the leg room.
Finger puppets are good value too.
If you're transitting for a couple of hours or so, check out if the airport has rooms and showers you can book by the hour. DD loved having a shower and a chance to stretch out on a bed and kick about.
What else? Zurich airport has a fantastic children's playroom and change mats, cots etc.
Having family at the receiving end when you're cactus with jet lag is wonderful! Just plan to stay long enough wherever you're going so that it's worthwhile. Good luck!