".aero" . "Some categories of users can register at the second level and others at the third level within appropriate second level names; some industry codes such as those of airports and airlines were automatically linked to appropriate sites even if unregistered" . ".aero" . "Active" . "ICANN registry agreement" . . . . . . . . "Credentials of applicants are checked before registration is permitted, but then any domain can be registered" . . "2002-03-17" . . "aero" . . . . . "Airlines, airports, and other parts of the air-travel industry" . "SITA INC B.V.(registry agreement ends in December, 2005 and new registry operator is being sought)" . .