A little help finding this story please.

Josh, Charlie, maybe Sam, and the intern with the grandfather who was a
high-level polititian (POTUS or VP or senator) are using the young
man's family jet on some sort of gov business. They run into Danny who
stuck at the airport because of a baggage handlers strike and invite
him along. The plane goes down in the mountains (bad weather) and two
unhurt passengers (Josh and Charlie, I think) have to hike to high
ground for a cellphone signal. I know it takes place after the
shooting because even though Josh isn't the only one with hypothermia,
he's the one they're most worried about.