This legal research digest addresses both federal and state cases brought in opposition to airport expansion or the development or operations at airports.  The research summarizes these judicial decisions and explains the basis of the challenge, the defense to that challenge, and the outcome of the case.  The collected cases are organized in a manner that conveys the strategies used by airport proprietors to address these challenges and identifies which strategies have succeeded, which have failed, and the reasons.  The results of the research is be organized by the type or category of the challenge and  includes a cross referenced index for those cases that involved challenges using multiple theories.