The Federal Aviation Administration is missing key information on who owns one-third of the 357,000 private and commercial aircraft in the United States - a gap the agency fears could be exploited by terrorists and drug traffickers.

The records are in such disarray that the FAA says it is worried that criminals could buy planes without the government's knowledge, or use the registration numbers of other aircraft to evade new computer systems designed to track suspicious flights.

It has ordered all aircraft owners to re-register their planes in an effort to clean up its files.

About 119,000 of the aircraft on the U.S. registry have "questionable registration" because of missing forms, invalid addresses, unreported sales or other paperwork problems, according to the FAA. In many cases, the FAA cannot say who owns a plane or even whether it is still flying or has been junked.

Already there have been cases of drug traffickers using phony U.S. registration numbers, as well as instances of mistaken identity in which police raided the wrong plane because of faulty record-keeping.

Next year, the FAA will begin canceling the registration certificates of all 357,000 aircraft and require owners to register anew, a move that is causing grumbling among airlines, banks and leasing companies. Notices went out to the first batch of aircraft owners last month.

Federal law requires all U.S. aircraft owners to register their planes with the FAA and carry the registration certificate on board. The registration number - all U.S. registrations start with the letter N - is painted on the fuselage or tail. The numbers are used on flight plan forms and by air traffic controllers to communicate with aircraft in flight. - AP

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