I get why they were trying to open it - to be nice. They usually just hand you the stroller all folded up and it's up to you to wrangle it open with your carryon in one hand and your baby in another. So they opened all the strollers on our flight and had them lined up in the passageway ready to go... only they weren't gentle with mine. they must have thought it was an umbrella stroller (It's NOT) and kicked it to open it up. Snapped the inch thick plastic bar on the footrest in half.
Oh ok, yeah. At least it still functions right, but I definitely see why you should duct tape it or something. Depending on how it broke, you may want to just take whatever remaining piece is left, if there is any, so there are no points or anything left to hurt the baby.