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JumpjetAccel
This flag is, in fact, NOT parsed. JumpJetAccel is parsed instead.
Typing JumpjetAccel instead will make the JumpJet unit never land in a similar fashion to BalloonHover. As a result, AG-only weapons won't target the unit. Only those with AA=yes. The unit will attempt to land, but never do so, but hovers in the air a short distance away from the ground.
In theory, mis-casing it can be used as a 'fix' for the problem with BallonHover-ers always willing to occupy the same cell as the target.