A Helijet is a multipurpose jet-powered VTOL (Vertical Take-Off and Landing) aircraft that is also known as the "Jumping Jack". Helijets have been used by both Government and Civilian organizations. Throughout the series, several different variants of the Helijet have appeared.
The Helijet was used to lower Mead then Reynolds into the pit in attempts to hook a line to the Sidewinder, in the hope it could be pulled out of the pit by helicopter. The attempts failed, leaving both men badly burned.