That wasn't directed at you. That said, I have 3 kids, ranging from 14 to 5. So I've done this a few times. Read my comment on umbrella strollers. I said once they sit up. I don't disagree with the pack and play but there are options to avoid the high chair. We vacation frequently, travel both by car and plane. I'm well versed in travel with kids. I also agree a fusion is barely big enough.We have the ones that strap into chairs. They take up a lot of space. We go on a lot of 5 or so day long trips. Our daughter has to sleep somewhere, needs a high chair to eat in, and when we use our stroller we often load it up with water bottles or jackets or whatever we need. Not to mention an umbrella stroller isn't exactly great for a newborn/infant. Its incredibly convenient to have a stroller that was designed to work with an infant car seat.
Point is, something like a focus/fiesta isn't big enough, hence why I said a fusion at minimum. I have a focus, and had a fusion. For family duties, the fusion was 100x better.