By Hunter Old - Once upon a time, you bought and registered an aircraft and it was registered for good as long as you continued to operate it. However, the days of a permanent registration for all aircraft are gone, causing a new headache for corporate flight departments everywhere. Under new FAA rules that took effect last fall, for all aircraft (including helicopters) that were registered before October 1, 2010, the registration expires according a table of rolling dates based on the month the current registration was issued. For example, if your current aircraft registration was issued between March and July of any year, its registration expires some time in 2011. Once re-registered, each aircraft registration then will have to be renewed every three years.