In addition to the different available lengths, the buses were sold with a variety of prime movers, ranging from conventional diesel and CNG combustion engines to diesel-electric hybrid.

The NABI 60-BRT was designed in response to a Los Angeles County Metropolitan Transportation Authority (LACMTA) request for proposal for the rolling stock on its forthcoming Orange Line (now G Line), which specified a vehicle that was "sleek, streamlined, and aerodynamic", carried three extra-wide doors to facilitate faster boarding, and were less noisy (78 dBA) than typical transit buses.

[13] LACMTA was the first customer for this model, as well, followed by LA World Airport's "FlyAway" service and Foothill Transit over the following year.

[14] The extended 65-BRT (nicknamed 'Longfellow') was introduced to service in September 2007 and required a special permit from CalTrans; to keep its weight similar to the 60-BRT, it only carries 8 CNG tanks as opposed to the 60-BRT's 12.

[19] The NABI factory in Anniston was then retooled to produce New Flyer Xcelsior low-floor buses for the United States transit market.