Be sure to ask about this though at check-in.

If you're flying in the U.S., they're good about returning the stroller. In Europe, the Middle East, etc. they often take it away and you only see it again at your final destination...where the bags come out.

Nasty if you have a long wait between flights!

Bring a bungee cord to double secure your stroller in transit. They can get damaged if they pop open en route. Also, on a larger aircraft, tell the crew you have a stroller waiting for you so they can direct you out the correct door (disregard if deplaning out of only one door lol!)