21.   Beyond the flight schools, however, most private planes are kept behind insecure fences at small airports.

22.   A fourth suspect attended flight school at Embry-Riddle Aeronautical University in Daytona Beach, Fla.

23.   A number of flight schools in the New York metropolitan area will rent planes of varying sizes to licensed pilots.

24.   A move Friday by Transportation Secretary Norman Mineta has effectively halted most student pilot training throughout the country, leaving many flight schools teetering on the edge of solvency.

25.   After his unsuccessful attempts to join the hijackers at flight school in Florida, he wired money to them from Germany.

26.   After a year of training at a Navy flight school in Corpus Christi, Texas, he chose to join the Marine Corps.

27.   After the September attacks, Congress imposed new restrictions requiring background checks of many foreigners studying at flight schools here, and immigration officials tightened visa requirements.

28.   Agency officials were further mortified when two of the hijackers received their student visas to attend flight schools six months after ramming jetliners into the trade center.

29.   Al-Shehhi and Atta had opened accounts at Sun Trust banks in Florida, and begun classes at flight school.

30.   Both men also trained at Huffman Aviation, a flight school in Venice, Fla., where FBI investigators are examining student records.