After reaching historic lows in 2021, the percentage of available used business jets for sale is creeping back up, marking a 14 percent year-over-year jump in December and a 6 percent month-over-month climb, according to analyst Jefferies. Meanwhile, pricing is up 21 percent from a year ago.

In the past six months, the available inventory is up 31 percent, Jefferies added, citing Amstat data. Young jet inventory—those less than seven years since production—have increased 64 percent year-over-year and 12 percent from November.

Despite these increases, only 3.3 percent of the fleet is for sale, well below the five-year average of 5.9 percent, Jefferies further pointed out. In December, heavy jet inventory increased by 27 percent, while medium and light jets were up 13 percent and 9 percent, respectively, from a year ago.

Embraer aircraft for sale rose 26 percent from a year ago, to 24 units, but inventory is still at 2.1 percent. Phenoms lead this increase. The number of Cessna Citations, meanwhile, has jumped 62 percent year-over-year. to 105 units for sale—driven by more XLS/XLS+, CJ1+, X, and Mustang aircraft on the market, Jefferies said. This is still only 2.7 percent of the active fleet. Bombardier aircraft inventory has scaled up by 71 percent, to 60 units, with available Challengers surging by 600 percent.

Gulfstream's available inventories similarly grew by 78 percent. Jefferies said Amstat data shows Gulfstream has produced 23 G700s as it prepares for a third-quarter 2023 entry-into-service. Ostensibly, 17 would be for customers, given the six flight-test airplanes.

Dassault's available inventories are also up 83 percent, but with only 11 units for sale that amounts to just 2.1 percent of the active fleet.

Meanwhile, list prices for available Cessna Citations are up 37 percent year over year. Embraer prices are up 27 percent, Dassault Falcons cost 15 percent more, and Gulfstreams saw a 3 percent increase. Bombardier inventory pricing increased 21 percent, but Learjets are soaring, with prices escalating 113 percent year-over-year in December.