Another name for jet fuel is "Aviation Kerosene" so it certainly is "Kerosene". It stinks like Kerosene (I've had the stuff running down my sleeves and soaked to my armpits in it, thanks to some leaky aircraft fuel valves of the "single point" variety, as I'm sure any former flightline personnel can relate to) so I can attest, it's just REAL nice Kerosene. Looks like it (kind of a straw color, as the fuel companies desribe it) and smells like it. Works great in these portable heaters, and we had customers (now I don't know if this was on-the-level or not for tax purposes) who brought in Mercedes (and one guy with one of those 5.7 Olds Diesels, this was in the mid-80's) for fill-ups of Jet-A.
I specifically didn't mention JP4 because I realize it is cut with Gasoline. I'm sure it's still made for the military in high performance aircraft. "Mil-Spec" can be applied to most anything, JP4 is different than JetA, but I think Uncle Sam is about the only customer for JP4, except for the handful of people who own their own fighter.
I'm no jet engine mechanic, but I can't believe there isn't a pretty darn high pressure pump in the fuel system somewhere. In the case of an airliner, I would think there would be several pumps involved in getting fuel from the wing tanks to say an engine mounted on the tail or rear of the fuselage.

Gilly

ps We also refuelled ground support equipment, such as aircraft heaters, tugs, and KVA (generators), that were all clearly labelled "Diesel Only" with JetA.