Hello everyone ? Girls, maybe someone flew long distances with childre…

Hello everyone ? Girls, maybe someone flew long distances with children our age? We're considering a flight of about 10-12 hours. And here I don't know how the child will withstand such a long journey... When she was 6 months old, the flight was 3 hours. She didn't even notice it! Everything was calm. But then, she wasn't even walking at least not yet ? How will she behave now, I have no idea ? Can you share your experience?