Iris Faraklas and Alan Humphrey - Missing

What we know so far:

• Iris and Alan had a backpacking permit to hike the Royal Arch Route in the Grand Canyon from May 17-23.
• They were supposed to meet up with family in Arizona on May 25 but they never did.
• Their car was found at the South Bass trailhead but there was no sign of them.
• Search and rescue teams flew over the southern portion of Royal Arch route near the rim, but did not locate the pair. Monday afternoon, rangers searched the remainder of the route without spotting them. Two rescue teams are also hiking the route and talking to other hikers.