When you arrive at your gate, tell the gate agent that you are checking your stroller there. They will put a tag on it for you with your name and flight info. Once you start the boarding process, take your stroller to the airplane door, fold it & leave it there. A baggage checker will take it and put it under the plane. At the end of your trip (and at any layover airports) the stroller will be brought out and put back on the jetway for you.
A few tips I have learned here to help minimize damage during tranport:
1) remove any accessories that are not permanently attached ie. canopy, cupholders. Things can fall or or get snagged so if you take off removable items they are much less likely to be damaged or lost. Put these in your checked bag and put them back on once you've reached your destination.
2) lock the stroller closed yourself. If it might pop open, then a bungie cord is a good idea. Baggage personnel may force an open stroller closed, in an effort to move things along quickly, rather than try to figure out how to close it properly.
Of course you can always buy a stroller bag for it which would help protect it more. I always felt this was a little too much trouble to go through for the kind of stroller we have but I certainly understand with some of the more expensive models out there why someone would want to take the extra effort to do that.
hth.