Some time, billions of years from now, well after the sun goes red giant, killing all life on earth, and the stuff that makes up the earth is eventually recycled into new planet material somewhere. Some of that material may end up in airport terminals. If humans manage to make it off Earth before the red giant stage, they'll probably build a New Los Angeles on New Earth, and that city is likely to have an Air and Space Port. The buildings there will probably be inspired by the current LAX and might be considered replacements. If we're lucky it will be possible to travel airside between all the terminals.