What is a good stroller for airline travel?

I have a four month old and I do not want to hassle with taking my whole travel system on the plane. My in-laws have a car seat for us so all I need is something compact and easy that I can use for an infant, preferably that can go in the overhead or captain's closet. I love the travel system I have here at home so I do not want to spend more than like 100 dollars on this one b/c I won't use it much. Any suggestions?What is a good stroller for airline travel?Umbrella stroller, small and folds easily.There rage from about $30 - $120, also check e-Bay you can way cheap.