Our twins are turning 5 and although we haven't used our double stroller (city mini) in over a year we're bringing it. Free to check it on the flight, easy to maneuver, canopy for shade, free and easy to park if we don't want it, nice to have if we do want it, and I think it'll create a bit of room for them to breathe in the crowds and chaos, watching fireworks, etc. I expect we will probably sell it on Craigslist or offer it to another family on our last day or something. No reason to fly it home.