We just travelled with our 7 month old and checked our Uppababy. It was broken when we picked it up at arrivals. Airline covered it, but sounds easier to travel with a travel stroller to avoid this.
We used yo-yo at 5 months and it worked!
I bought the ergobaby metro+ for travel and the seat lies back almost completely flat and then the footrest come up to create a pseudo bassinet for the baby. A lot of people in my bump sub on Reddit have recommended this stroller for travel.
I'm travelling tomorrow with a 4 month old and checking my Uppababy