The circumstances of where you're trying to do work can really dictate how well you do your work. I know that for me, there are certain kinds of work that I won't do well when I'm in an airport or in an airplane. What makes Angela happy and productive is devoting 100% of her time on an airplane to working.
Are those travelers on their laptops just showing off? Why does V8 taste better at 35,000 feet? And why won't Angela chat with her seatmate?