Chaine Downer Jr. (b. July 6, 1993), better known by his stage name CJ Fly, is a rapper from Brooklyn, New York City. He attended Edward R. Murrow High School for Communication Arts, which is where he met fellow cofounders of the Pro Era hip-hop collective Joey Bada$$, Capital STEEZ, and DJ Power Pleasant. The four of them would spend their school days cyphering in the auditorium and by 2011 they had formed Pro Era.

CJ Fly released his debut mixtape Thee Way Eye See It in 2013. He then released Flytrap three years later in late 2016. He has also been featured on multiple Pro Era projects such as:

The Secc$ Tape Vol. 1 & 2

P.E.E.P: The Aprocalypse
The Shift

However, he was not featured on Pro Era’s 2016 self-titled project.