I'd buy something once I'd got through the airport. Like a sandwhich, fruit pot etc. Lots of toys to entertain them, ideally something they haven't played with before as they will be even more curious x
Anything he likes. You can make food and bring tupperware box. We usually do loads of snacks and get a sandwich at boots. Anything that keeps her entertained for longer
We ordered loads of his favourite snacks to pick up at boots once we was through security and then brought some food while sat around in the airport . Worked great for us, we made sure to buy enough from boots to have enough for the way home aswell
We just went on a 7 hr journey and got a ham sandwich when we got through the gates and took that on board as well as loads of snacks she was absolutely fine x
Before boarding get them to eat saves you the hassle on the plane if they don’t want to eat in that chaos
Not been on a plane, but we have sandwiches and rice cakes in the car.