Can you open and close the stroller with one hand and can it fit in an overhead compartment on the plane?
Hi, there, new mom,
The Nuna Pepp Next doesn't fit the overhead compartment on a plane, I am sorry. It is much too tall when folded for that (93.5 cm). This is a small, reasonably compact city buggy but not an ultra-compact travel stroller - read more here. Also, here are some examples of smaller, plane-friendly ultracompacts that were best this summer.
About the folding system, it is not one-handed either. You need to open both locks on the handlebar sides and push it in, then close again, and also, there are two pull-up levers on the sides that require both hands. You can check the folding in this video at 1:06.