The pre-owned business jet market continues to be "very active" and there is renewed optimism for 2015, business aviation research firm JetNet noted in its full-year 2014 report. Though JetNet's data shows pre-owned business jet inventories deflating to 11 percent at the end of last year, down from 12.5 percent in December 2013, it continues to be a buyer's market. Notably, a new record of 2,569 pre-owned business jet retail transactions was set last year, besting the previous peak of 2,181 in 2007. Year-over-year retail transactions for used business jets surged by 8.1 percent in December, yet average asking prices for pre-owned business jets continued to slide, falling 10.4 percent from a year ago. Business turboprop and turbine helicopter inventories were unchanged from 2013 at 7.7 percent and 6.4 percent, respectively. However, JetNet said retail transactions for used turboprops slipped by 11.6 percent, and those for turbine helicopters dropped by 7.3 percent. Average asking prices for turboprops softened by 1.7 percent, while pricing for turbine helicopters firmed up by 0.7 percent.