In the first nine months of this year, accidents involving both U.S.-registered and non-U.S.-registered business jets increased over those recorded in the same period last year. According to figures compiled by AIN, the total number of nonfatal N-registered business jet mishaps increased from 21 in the first three quarters of last year to 23 in the same time frame this year. Fatal accidents climbed from one event last year to four this year and fatalities jumped from four last year to 17 this year. All the fatal accidents in both periods befell Part 91 operations. This year there was one nonfatal accident involving jets flying under Part 91K fractional operations, the same as last year. Jets flying under Part 135 air-taxi operations suffered three accidents in the first nine months of this year, down by one from the same period last year, and had their second straight nine-month period with no fatalities.