Huh. Reading the NPC entries in Only War, both Chaos and Imperial Troops get Operate (Surface) skills, while Dark Eldar and Orks get Operate (Surface [Hover]) and Operate (Surface [Rokkit Pack]) respectively. Also, according to the Operate skill entry, jump packs should be an Aeronautica operate, not a Surface.
This looks like there is definately an error here- either its meant to be more general, as in (Surface) is all you need, or you are supposed to sub-specialize. Look like this will have to be errata'd.
Alternately, those dirty xenos just can't learn to fly/drive everything with a single skill. Proof of their inferiority to glorious Humans!
Actually up untill now jump packs have required Pilot[Personal].
I think the issue is that once again FFG have lazily copied and pasted from earlier books without properly checking that it makes sense.
Considering how powerful it would be to allow characters to pilot ALL types of vehicles with a mere 3 skill purchases (Surface,Aeronautica, Starship) i would rather it be split up into its constituent types of vehicles (Wheeled, Tracked, Skimmer, Personal, Aeronautica etc).