The parks were spurred into decision-making by a 2019 lawsuit filed by the non-profit Public Employees for Environmental Responsibility (PEER), which resulted in a court order demanding that any park hosting more than 50 sightseeing air tours a year develop a management plan by August 22, 2022. Twenty-four parks, including top-bill destinations like Glacier, in Montana, and Great Smoky Mountains, in Tennessee and North Carolina, were named in the resulting court order.
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