Here are two tips for your consideration. First, I've watched two episodes of an interesting documentary on PBS: "Islands in the Sky". This covers the infrastructure necessary to support safe airline flights. Very informative and interesting. During the program they state that at any one time there may be as much as a million people in the sky at one time!
The second tip is you can watch the documentary on your iPad. Just download the PBS app from the Apple Store and open it. Not only is this documentary available, but many other TV shows as well, such as Nova, et al. And even though the iPad screen is small, viewing a program such as this works quite well. This PBS app may be available for an Android tablet as well, but I'm not sure.
Give this a try -- you'll be amazed at how many interesting programs are available on PBS.