During the news report, the reporter says that Marks wasn't born in America, but Northern Ireland. This is a reference to Liam Neeson who is originally from Northern Ireland. Also, Marks' US passport list his place of birth as 'Belfast, Northern Ireland'.
Could be a coincidence, but the two main female cabin crew members portrayed by Lupita Nyong'o and Michelle Dockery share the same onscreen names as Jaqueline Bisset's and Karen Black's flight attendant characters in Airport and Airport "75", Gwen and Nancy.
During the beginning of the movie, he gets out of his car, both hands exposed. He then walks away with a briefcase there is no way he could have gotten.
As the plane levels out from the dive down to 8000 ft, the cabin experiences weightlessness. This, however, would only occur if the plane began to dive after a quick ascent, not from quickly pulling up. The people in the cabin would actually be forced down into their seats due to the increased G force.
When the plane is supposedly heading north (to Iceland) the rising sun is shown on the left side of the plane. Obviously when heading north, east is to the right.