This document records criminal incidents that took place against civil aviation aircraft and interests worldwide in 1998. A new appendix, Appendix G, appears in this year's Criminal Acts report. This appendix identifies which aviation incidents in the past five years are considered politically motivated acts. Incidents for 1998 in this category are so identified in the individual incident summaries contained in the geographic regional reports. Twenty-two incidents involving attacks against civil aviation interests worldwide were recorded in 1998. This is one fewer than the number of incidents recorded in 1997 and also the fewest recorded in Criminal Acts against Civil Aviation since the report was first published in 1986. The sub-Saharan Africa region recorded the most incidents in 1998 with seven, while Europe ranked second with six incidents. Latin America and the Caribbean geographical area accounted for five incidents, three were recorded in Asia, and one was recorded in North America. Neither Central Eurasia nor the Middle East and North Africa region had any incidents during the year. The Democratic Republic of the Congo experienced the most incidents (four) of any one country in 1998; three of these were commandeering's that occurred between August 2 and 4. The highest percentage of incidents in 1998 (41% or nine incidents) were hijackings.