^Hi Oreo, ako ulit!
We've just completed another long haul trip (12+ hrs) and here are my tips:
1. If baby/toddler is already walking, bring a baby harness along. Mahilig talaga sila maglakad lakad at sasakit ng husto ang likod mo if you bend to hold them and support them. Hubby was in charge of walking him around the cabin and the galley area when the baby got antsy na. This is a great way for them to burn energy. Hopefully baby is smiley and friendly - most passengers react positively naman to a smiling baby.
2. If budget permits, travel business class or premium economy because the space really makes a lot of difference. Depending on the airline, they won't give you a separate seat for the baby and if it doesn't make sense to bring a car seat along (if they're not giving you a spare seat for baby, then there's no point for a car seat - unless you're paying for a seat for baby), it's better that you are able to recline your seat as much as you can or at least, lift the arm rest so that baby can sleep across the seats on your lap. If in business, you can lie the bed flat (some airlines), and your kid can sleep very comfortably.
3. If she doesn't follow her usual sleeping pattern, that's okay. Expect her to be out of sorts (especially when jet lag is involved) for a few days. We traveled at during the day (did not work for us), we've traveled mid day (sort of worked), and also night, although not red eye flight. I think the one that worked best was the early evening flight. As usual, he had his meal, then a story time, konting play, then he slept according to his schedule - which was about 7 hours straight. After that, konti nalang flying time, which was spent watching the video, eating, playing with the magazines, etc.
4. Inflight entertainment - bring books (if she likes books), toys (her favorite toy), a new toy (gadget or something to keep her busy figuring new features, etc), download apps on your ipad or phone. I had to apologize to SQ kasi napunit ng anak ko yung mga inflight magazines and menu - pero if that kept him busy, then the flight crew were just happy to oblige.
5. Inflight meals - I mistakenly ordered a meal for my son. A big lesson learned. He hated it. As in pati kami when we saw it, hindi talaga sya appetising, itsura pa lang. When I tasted it, yuck din. Good thing they also have baby food in jars, so humingi nalang ako nun. And I had him eat the mashed potato from my meal. And we also asked for a spare adult meal din. My suggestion is to bring your own food - preferably sealed well if you are going through customs/airport inspection, or just pre order a kid's meal or an extra adult meal. You can then either mash or cut the food into sizes that your child will be able to handle.
6. Bassinet - hay naku. Ako din give up na ako dito. Hindi talaga umupo man lang sa bassinet ang little boy ko, so naging extra compartment nalang sya kung saan ko nilagay ang diaper bag nya, etc. If space is not an issue (see point #2), then keep the bassinet - you never know baka magbago sya ng isip. In any case, most airlines will ask you how heavy your child is, if beyond a certain weight (14 kgs for SQ if I remember correctly), they won't give you a bassinet.
7. Toilet & Nappy Change - This is a little bit trickier than handling a younger baby. My baby no longer lies down when getting changed and insists on standing up. And of course the nappy changing table is usually higher than usual plus the ceiling of the toilet is not really that high so, either mauumpog si baby or naka yuko sya. I had no choice but to put the toilet seat and lid down and let him stand on it. I hung the nappy kit sa hook by the door, and then used up a lot of the tissue paper and the towels as part of the whole process. My boy wanted to touch everything pa, so I had to make sure that whilst I was changing him, I had to keep an eye on both his hands and then make sure that he was all balanced and standing comfortably on top of the toilet lid. Once I've finally finished changing him, I give him back to hubby so I can then tidy up the toilet (throw the dirty nappy, used tissues, wipe the basin, etc.).
If I think of anything else, I'll post later!