Eldar and Dark Eldar have them on Bikes, as do Legion Space Marines (and Sammael). They are "Jetbikes". looking through the Daemons Summary, the Blue Scribes, Screamers, and Plaguedrones are all Jetpack units (although only Blue Scribes and Plaguedrones are specifically Jetpack *Unit Type*).
@Creon, there is a difference between Jump *Unit Type* and Jetpack *Infantry type*
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