The Learjet 29 is identical except for the addition of a long-range fuel tank, resulting in the reduction of the capacity to six (two crew and four passengers).

[4][3] The Learjet 28/29 was the first production jet aircraft to utilize winglets[5] (entering service in 1977).

Both models were commercially unsuccessful, showing reduced range compared to the Learjet 31, as the addition of winglets required the deletion of the earlier model's wingtip tanks, and they sold mainly to customers with a requirement for good altitude performance.

[7] In 2013, the FAA modified 14 CFR part 91 rules to prohibit the operation of jets weighing 75,000 pounds or less that are not stage 3 noise compliant after December 31, 2015.

Data from Jane's Civil and Military Aircraft Upgrades 1994–95[4]General characteristics Performance