Regarding the electric issue, as with all things electric or electronic, check the input specification on the pump. It may be a small plate on the pump, or it may be on a folded over label on the cord, or it may be printed either in the instructions or on the box.
If it reads something like "110-120 Vac 60Hz" you are out of luck with that pump. If it says something like "100-240 Vac 50/60 Hz" you would be good to go just having to spend a dollar or two on a simple adapter to change the physical shape of the plug.
Can you let me know what the sticker/plate says?
When I was looking into breast pumps mankind was still using chisels on stone and using quills with bottles of ink, and all the pumps were plug-in wired. I'm guessing that maybe some pumps may use batteries now, or maybe use chargers? If so you will be able to step away from the pain-in-the-neck wire and be much more comfortable. It would be so much easier on the plane too.
I wonder.
I hope you have a wonderful trip, and not too many tears leaving the baby behind (yours, not hers).
You get my full support for breastfeeding your little one. It isn't always easy but is just so very good.
Congratulations on the baby!