Anonymous wrote:City mini. We used the one we had already when we went to England and gate checked it both ways. It was fine.
I know it's not a travel stroller, but this would be my suggestion too. It's the most compact of all the full-size strollers, and so much more comfortable for older kids than a travel stroller. You can get a ride on board for your eldest if you want. Also, they are indestructible. We've traveled with ours for 3 years, dozens of flights, taken it to cities, beach towns, the dessert, dusty ruins. The tires are worn down from the miles but otherwise it's in perfect shape. It's not as cute as the minu or yoyo but it will also last longer -- both of those get really snug for kids once they hit 3, I've found.