Catie Kilgus, 20, of Doe Run, a sophomore majoring in English and minoring in environmental studies, told The (Somerset) Daily American that she missed last year's tree planting, so she wanted to come this year.
"We've studied environmental issues with the site, both because of the crash and that it was previously mined," she said. "This is a good way to give back by planting trees."
Ashley Wilmont, 22, of Hughesville, an environmental studies major, was back for the second year.
"It was really special to see the beginning of the tree planting and this year how the site has changed," she said. "I wanted to be a part of something bigger than myself and to honor those on Flight 93."