Yep, interesting snacks, lots of nappies, and the sling is key. Be super polite and co-operative to the airline staff, they can make a big difference to your flight. A straw type sippy cup or anything which encourages them to suck (for ears) iPad / phone with videos, photos. At that age ours liked photos and videos of himself and other babies. And just do your best. We have done lots of long haul and luck plays a big part. Have fun!