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Cropduster flights resumed Sept. 25, 2001. The FBI had ordered cropdusters grounded nationwide temporarily in late Sept. 2001 when investigators discovered that several of the suspected WTC hijackers had shown persistent interest in cropdusters and the possibility of buying one. Such planes would be ideal for dispersing biological agents as aerosols over populated areas -- and they are often little guarded or controlled. While farmers feel aerial spraying of pesticides is often needed for crop protection, environmentalists have worried that spray drift could harm people living nearby.