breastfeeding/pumping while traveling on an Airplane...

Ann
I need some advice...any other moms out there traveled with an 8 mo old (give or take) who's EBF and pumping...I generally nurse my daughter any time I'm with her but sometimes I feel full on one side (she just eats one side) so I'll have to pump...I'm flying on a 5.5 hr flight...is it easy to pump on the airplane ? How do you wash your pump parts (or do you just not?)  is it stressful bringing the pump and bottles through security? 
Also, I know the car seat and stroller are free to bring on the plane...do they charge for pack n play too? I'm so new to this!! Any help would be AWESOME