Posted By:
Joe D.Dan,
I think they are consecutive photos.
In photo one: the guy sitting in seat 4F is putting mustard on his hot dog.
In photo two: the hotdog is half eaten and the gentleman has a mustard stain on his collar.
I don't think more evidence is needed than that 
seriously - very cool photos.
edit to say:
awesome story David. Must have been an exciting pickup.