I flew out of LAX for SEA one time with $10k+ in cash on my person, although I think I was flying to Bangkok not anywhere in PI. They actually didn't want to let me board because I didn't have a return ticket to the U.S. (cheap onward ticket to another SEA country not sufficient they wanted a return ticket to the U.S.)
Sharked my way through it in the end somehow and ended up boarding with no return ticket at all, tricked them somehow...just got lucky probably
Guess I also got lucky they didn't ask me about money, because I think I had about $12k on me in cash (my liferoll at the time btw so not trying to brag at all.)