Recent accidents; growth in regional airline traffic; new, low-cost start-up carriers; contract maintenance activities; and increased media attention all have served to heighten awareness of commercial aviation safety in the 1990s. Using the 5-M model - Man, Machine, Medium, Mission, and Management - as a structure for this text, Wells integrates the latest research in human factors, air traffic systems, and aircraft technologies to provide the most comprehensive and up-to-date treatment of the subject.