FLAGSTAFF, Ariz. (AP) -- Four people who died in a northern Arizona plane crash had planned to eat lunch and sightsee in Sedona before their plane went down in a remote canyon.Jonathan McGreary, of Flagstaff, was flying the single-engine Cessna when it crashed Sunday. The National Transportation Safety Board is investigating the cause.McGreary's father, Dennis, told The Associated Press on Wednesday passengers included Levi Wallace, of Prescott, a woman from Canada and another woman from Germany.He says the four met through Christian youth camps and stayed at his Flagstaff home over the weekend. He says they were vibrant, full of promise and deeply devoted to God.FAA records show the 22-year-old Jonathan McGreary earned his pilot's certificate in 2011. His father says he recently worked as a heavy equipment operator.© 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.