While it might be strictly true that a US-ian can't be denied entry to the US, recall that there is no constitutional right to any particular mode of travel...

While it might be strictly true that a US-ian can't be denied entry to the US, recall that there is no constitutional right to any particular mode of travel... One can "enter" the US in various foreign airports (Shannon, several in Canada) and doing a "nope, I'm not talkin'" gig will probably result in a "well, you ain't flyin' either". I also worry that being too hostile with one's baggage might get it blown up. Certainly get it inspected closely. Might not be too good for cameras, laptops and other storage media.