If your guns are unloaded and locked in the trunk, you can travel just about anywhere in the US with no problem. If your vehicle doesn’t have a trunk, invest in an airline approved lockable gun case.
http://www.gpo.gov/fdsys/pkg/USCODE-2011-title18/html/USCODE-2011-title18-partI-chap44-sec926A.htm
Thanks for the info.