We flew our 2 year old to italy without any electronics but with lots of books to read to him, sticker play (think sticker books, scenes to create, etc), latch boards, lacing cards, crocodile dentist, lift the flap things, portable chalkboard/dry erase board that also stored crayons, paper and coloring books, felt boards, magnet scenes and his favorite stuffed animals. I'm happy to report no international incidents! At least, not on the flights... :)
ETA:
We weren't this lucky, but many of our friends that travel internationally report their kiddos fall asleep, esp on the night flight out, and they as parents get to sleep, too! They also watch the tvs on the flights. My son is scared of televisions and movies so our biggest challenge was keeping his head down for 10 hour so he wouldn't see the screens all over the plane.