Jetpack is called AOL CD Thrower in the console on pickup (and name inconsistency)
If you pick up a Jetpack the console message is:
You got the AOL CD Thrower
The centerprint however says:
You got the Jet pack
and if you run out of fuel:
You don't have any fuel for the Jetpack
Also the mutator is called "Jet pack" in the menu, while all g_jetpack_* descriptions use "jetpack"
So everything needs to be either "Jet pack" or "Jetpack".