Within the framework of this broad subject, the paper focuses on some of the intra-mural technical and operational planning activities of an airline resulting, directly or indirectly, from airport restrictions of one form or another. While some of the overall problems discussed are, by their complexity, not within the powers of the airline industry on its own to solve, examples are given: (a) of the actions which an airline can take to minimise the effects of a given problem, and (b) of the contributions that an airline can make to solution of that problem. Attention is drawn to conflicts and anomalies in some of the limitations imposed on the airlines by the airports. Several cases in which airport restrictions are beginning to impose new burdens on the aircraft designer are cited.