I just flew into the US with an expired passort 3 weeks ago.
The hardest part was convincing the airline to actually issue me a ticket.
At the ticket machine i scanned my passport - It picked up my passport was expired and I had to talk an agent into getting my boarding pass.
When i went through US customs the border guard didnt even notice my passport was expired, and when he scanned it, there were no alarms or warnings. I just boarded the plane and it was all good.
Canadian customs didnt say anything to me coming back either.
Easy Breezy.
TRUTH: it's the new hate speech.
In a time of universal deceit - telling the truth is a revolutionary act. - Orwell