I'm pretty sure it's perfectly legal to fly as much cash as you want domestically. [1] However, if they're scanning for other paper products that are potentiall

I'm pretty sure it's perfectly legal to fly as much cash as you want domestically. [1] However, if they're scanning for other paper products that are potentially illegal, LSD comes to mind. [1]: https://travel.stackexchange.com/questions/36740/is-there-a-legal-limit-to-the-amount-of-cash-one-can-carry-on-domestic-us-flight https://travel.stackexchange.com/questions/36740/is-there-a-...