Life got a lot easier when our children were old enough to go to the toilet on planes without our help. When the younger one needed to go, her big sister would take her. Everything stopped being such a fuss. Oddly, I can't remember exactly how old our daughters were, but I am guessing it was when we flew to Europe when they were aged 7 and 5.
This independence meant I could relax as I watched parents with younger offspring get in and out of their seats to wrangle the paraphernalia that babies and toddlers seem to require. Not to mention the desperate rush when your potty-training children tell you they need to go to the loo, usually at the most inconvenient moment possible, such as when your food has arrived or the drinks cart is in the way. "We don't have to worry about any of that carry-on anymore," I would think to myself with a satisfaction bordering on smugness.
The next step was for the girls to be seated together on a plane for shorter international flights, not split up and paired with my husband and me. After all, they had sat together on domestic flights as unaccompanied minors to visit their grandparents. What could go wrong?
Our children are well-behaved, responsible and know how to distract themselves from boredom with airlines' inflight entertainment systems. But they are still children (albeit 11 and 9 now).