Prospective new owners intend to revitalize the vintage Mt. Waterman ski resort in the Angeles National Forest — in part by selling exclusive access to coveted powder days to well-heeled customers and ferrying them to the mountains in chartered helicopters.

But there’s a snag: The federal agency that has the final say on what can be done at the homey 390-acre resort hasn’t approved such a plan and said it would be hesitant to sanction anything that smacked of exclusivity.

“I’m pretty confident we would not allow … any kind of exclusive use,” said the U.S. Forest Service’s Justin Seastrand, who oversees the public services staff area of the Angeles National Forest.