score:15
You'll need a form of ID, but legally once you're in the country you can take any form of transport that a US citizen can. Plane, train, bus, ferry or automobile - your citizenship will have no bearing on whether you can use it.
Upvote:8
No problems whatsoever. Foreigners take US domestic flights quite often. Just show your passport to the TSA when passing the security lane, and even your Canadian driving license might be enough - check on the TSA site.