What the OP is talking about are one of the few new strollers that actually do fold small enough to be stored in an overhead bin. When folded they meet the size restrictions for most airlines to be brought onboard as a carryon item.
I have seen a couple so far. One was being offered on Zulily for a time.
They are somewhat pricey, but they seem like they might be worth it if you travel a lot.
We use an Uppababy G-Lite and have gate-checked it oodles of times without issue. Our BabyJogger City Mini has also been gate-checked a lot. It does great, also. But I can definitely see the attraction of not having to mess with the gate check process. If our second (and last) kid wasn't already 2 years old I might consider getting one. They always come out with better stuff right after your kids are too old for you to get to use it.
