I can tell you that thinking about flying with a toddler is worse than actually doing it - I flew in April on my own with a 25 month old and a four month old. The bub was easy (a few BFs and constant holding!) and for DS1 I got a few new books and a couple of small toys. Plus I took some food and his water bottle. But what kept him quieter than anything was chomping away on pringles chips. He wouldn't normally get them, but I figured it would be a good diversion. It was. The boys were terrific and the flight time, um, flew by, fairly quickly.
DS1 needed a little reassurance right on take-off and landing - I don't think he knew what to make of it - so we had a few cuddles (with DS2 squished on my lap) and I just talked to him about what was happening and tried to make a real adventure out of it. He was totally fine otherwise.
Good luck!