It totally depends on the kid and the type of trip. When they are younger traveling a long distance isn’t so bad if you can rest and relax for several days once you get to your destination. When my oldest was 18mo, we flew from Minneapolis to Hawaii. The last bit of time on the airplane was tough but we relaxed on the beach all day, every day after that and it was fine. Our next longest flight was to France when the twins were 6yo. We stayed in a very roomy house where they could run around and play and relax at their leisure and recuperate from the long flight. We only took small little day trips to keep them from driving each other crazy in the car. Melatonin took care of the jet lag, for the most part.
Last summer we took 2 trips that were hard for them. Both of them were with guided tour groups where our days were almost completely planned out. The second trip we moved hotels every 2 days. There wasn’t much down time. But we brought electronics along, including extra battery packs and charger cords, cards and bought extra snacks every chance we got. We sat near the back of the bus and the kids entertained themselves when they were tired of listening to the tour guide commentary. Those were fascinating trips and the kids did well (the rest of the elderly travel companions said so too!) but we all agreed we wouldn’t want to travel that way very often.
" I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent." Mahatma Gandhi
"This is the ultimate weakness of violence: It multiplies evil and violence in the universe. It doesn't solve any problems." Martin Luther King, Jr.