Jackrabbit is Alex Sector’s everyday mask, the one he wears whichever vehicle he happens to be in. It lifts him off the ground for a short time and lets him fly a short distance, and the fan wiki says the flight is shown in every episode where the mask appears. Its list runs from The Deathstone through Gate of Darkness.
The vehicle assignment is where the sources part. Wikipedia pairs Jackrabbit with the Rhino truck, and Matt-Trakker.com lists Alex as co-pilot of Rhino and Firecracker. Our own toy records list only the Lifter and Ultra Flash masks for the Rhino toy, and put Jackrabbit in two other places: the 1986 two-pack of Alex Sector and Buddie Hawks and the 1985 Boulder Hill playset.
The wiki also records that the Disruptor mask Alex wears with The Collector is the same sculpt in a different color.