Since alcohol is also covered by state laws, you may not be legally permitted to carry this quantity of alcohol between states. You should check the jurisdiction you wish to show your beer at to see what transportation/"importation" restrictions may be. A keg would certainly go beyond the test of "personal consumption" that permits us to import Duty Free spirits. You might have to ship it as freight.

Just curious, what style would you have been brewing? Me hopes a nice hoppy IPA or American Pale style...