From Halopedia, the Halo wiki
The Uztet'sKelln-pattern was a combat flyer with no modern analogue, considered one of the earliest equivalents to what would eventually evolve into the Banshee, produced by the Sangheili race. Named and designed off of the predatory and voracious 'sKelln piloted by the sky-chevalier orders, the Uztet'sKelln was considered to be unreliable and slow—at least when compared to its descendants. The model featured a smooth, sophisticatedly contoured canopy and was powered by a twin impulse drive, and essentially served as the predecessor for all future Banshee designs and models.
The Uztet'sKelln was often used in ceremonial roles and was designed with elaborate ornamentation. They were used in the Covenant Honor Guard or were directly commissioned by kaidons as personal transports.