Relating to the possession of firearms in certain public locations.

Authorizes city, county, metropolitan service district or port operating certain commercial airports to adopt ordinance regulating or prohibiting possession of firearms in public buildings by concealed handgun licensees. Authorizes school district, college or university to adopt policy regulating or prohibiting possession of firearms in public buildings by concealed handgun licensees. Punishes possession of firearm in violation of ordinance or policy by maximum of five years' imprisonment, $125,000 fine, or both. Modifies definition of public building, for purposes of crime of possession of weapon in public building, to include certain airport areas, buildings owned or controlled by state or city agency and real property owned by college or university. Punishes violation by maximum of five years' imprisonment, $125,000 fine, or both. Exempts from prohibition person possessing firearm in certain airport areas when firearm is unloaded and in locked container for purposes of transporting firearm as checked baggage.