6, 7 and 8 have common security. Most of the others don't. Unless you are flying with an airline that has a codeshare-type shuttle between terminals, you are out of luck. You'll need to prearrange for a gate pass. Beware that if you are checking luggage, some terminals (I don't know about 2) have halfassed TSA setups where you check in, and then go elsewhere with your tagged luggage, in a line, where you wait. And wait. Enjoy LAX.