Define "underage." Information supplied by the question is incomplete. However, this general statement can be made: States do not "extradite" minors" unless they are wanted for criminal offenses. Runaways are taken into "Protective Custody" and returned to their parent/guardian in their state of residence.
Yes, any state will extradite to any other state.
Fly you in an airplane, or drive you in a vehicle.
In accordance with the US Constitution, any State will extradite anyone to any other State at that State's request.
No. There aren't any states which flat out won't extradite - the only thing which varies between states is what they're willing to extradite for.
Extradition from WHERE? If the offense was serious enough and the feds wanted you badly enough, they could, if they wanted, extradite you from any country with which the US has an extradition treaty.
Theoretically (and legally) any state can extradite from any other state for any criminal offense. Whether your individual offense will qualify or rise to a level where they might want you is impossible to determine without more infomration. Suffice it to say that most all states WILL extradite persons wanted for felony offenses.
Any state can extradite for any reason at anytime. With that being said Indiana usually will not extradite for misdemeanor probation violation.
All states honor each others extradition requests. There are no "safe-haven" states. It cannot be said with any certainty exactly what a particular state will extradite you for. Most states WILL extradite for felony offenses.
If PA said only a surrounding state, that is what they mean. So for example, they will extradite you from MD, since it touches PA, however, they will not come to VA to get you. Below info is to the idiot that keep changing the answer and is clueless and obviously stupid when it comes to the law. When a state issues a warrant it decides if they are willing to extradite you and if so how far they are willing to travel. Some states will not extradite outside their city for petty things like bad checks. While others will only extradite inside their state. Then you got some that will extradite from any state that is surrounding them, aka touching them. Then of course they can go wherever they want to in the country.
All states extradite to all other states. Some wont extradite on some cases, but they are few and far between. If California asserts that they will extradite/accept the person back (and arrange the transportation), all states will cooperate with the extradition. You can try to run to a handful of other countries, but why not just get it behind you, and turn yourself in.
All states COULD extradite on any criminal charge if they wanted to. The question is, will they? Is the offense serious enough to warrant extradition? No one can answer this question with any degree of accuracy until the individual circumstance arises.
No, its your life authorities don't have any control over underage couples staying the night with each other.