The People's Republic of Illinois says it's a felony to travel with a firearm.
Wrong.
Link Removed
"IF A NON-RESIDENT IS VISITING ILLINOIS,
HUNTING, OR TRAVELING THROUGH WITH
A FIREARM, HOW DO THEY LEGALLY
TRANSPORT IT?
Non-residents must be legally eligible to possess
or acquire firearms and ammunition. Non residents
are not required to have an Illinois FOID Card. It is
recommended that in order to be in compliance with all
statutes, non-residents transport all firearms:
1. broken down in a non-functioning state; or
2. not immediately accessible; or
3. unloaded and enclosed in a case, firearm carrying
box, shipping box, or other container."