Just checked a sample AD 8050-1 (Aircraft registration document). It pretty clearly asks one to Certify (immediately below the 'you will be fined or imprisoned if you make a false statement' bit) that one is either a US Citizen, Resident Alien, or Non-Citizen corporation (and the aircraft is properly based in the US).
Last edited by mm_flynn; 18th Jun 2012 at 12:45.