Following the events of the terrorist attacks on September 11, 2001 the Federal Aviation Administration changed the rules for the landing and departure of general aviation aircraft at LaGuardia. Pilots operating a non-scheduled IFR flight are now required to make a reservation via the FAA's e-CVRS system no more than 72 hours prior to the flight's arrival or departure while public charter flights may make a reservation up to six months prior. Unscheduled IFR flights may only operate at LaGuardia with a reservation from the hours of 6:00 am to 9:59 pm local time Monday thru Friday and 12:00 pm to 9:59 pm local time on Sundays. Reservations for unscheduled IFR flights are not required all day on Saturdays. Aircraft without a reservation will be redirected to either Teterboro Airport or Linden Airport.