After receiving news of a possible invasion Texas initiates Chemical Defense Protocol 1, all aircraft fuel is injected with special chemicals that cause their vapor trails to expand into thick fog sheets instead of dispersing normally. We put a major discount on all regional flights to encourage domestic air travel to speed up this process. Over time a fog sheet is formed around Texas, completely obscuring it, preventing enemy reconnaissance and basically making very hard for invaders to enter without getting lost. Navigation will be nigh impossible for any invaders
