6 Portable metal airport buildings, and metal structural parts therefore, namely, floors, walls, ceiling, and extension braces; portable metal airport expansion buildings, namely, non-motorized walkways, baggage loading/unloading bridges, terminal buildings and hold rooms, and metal structural parts therefore, namely, floors, walls, ceiling, and extension braces; portable metal airport expansions, namely, non-motorized walkways, baggage loading/unloading bridges, terminal buildings and hold rooms, and metal structural parts therefore, namely, floors, walls, ceiling, and extension braces; temporary portable metal airport buildings, and metal structural parts therefore, namely, floors, walls, ceiling, and extension braces; temporary portable metal airport expansion buildings, namely, non-motorized walkways, baggage loading/unloading bridges, terminal buildings and hold rooms, and metal structural parts therefore, namely, floors, walls, ceiling, and extension braces; metal structural parts for temporary portable metal airport expansions, namely, floors, walls, ceiling, and extension braces; portable airplane passenger loading bridges made primarily of metal