In Slack v. Slack, the Pennsylvania Commonwealth Court reviewed the order entered by the trial court denying post-trial relief following the non-jury verdict in favor of Appellees. The trial court ruled that a private airstrip was not in violation of local zoning ordinances and would be permitted to continue operation. The Court affirmed, ruling: first, the airstrip was a lawful use under the local zoning ordinance; second, the evidence was not sufficient to prove that Appellant and her property were substantially affected by the operation of the airstrip; third, Appellees were entitled to argue the affirmative defenses of laches and acquiescence.