Ok so I travel to Chicago all the time for work. I read that Illinois allow out of state permit holder to carry in the car. It says
" As long as you have a ccl in your home state you can carry a gun in your car. The gun can not leave your vehicle for any reason. If you leave your vehicle the car must be locked or the gun must be put into a lockbox."
Someone had said to me Chicago law was different. So I was looking into this and I can not find anything that say different. In fact after Chicago lifting the ban of guns in 2010, the only difference is that Chicago has banned certain guns in 2013. So if there is anyone that knows more then I have posted please comment.