Flying and Breastmilk?

I have to go outta town for work related reasons from Wednesday to Saturday which means I have to leave my LO at home.

I exclusively breastfeed and I was wondering if anyone has any experience with TSA and breastmilk? I was planning on pumping while I was away but I’m not sure if or how much is allowed on the plane and I’d hate to just have to throw it away 😭😭

Anyone know what the rules are or have any experience with this?