It makes a large difference, but I think focusing on the presence of "additional distractions" misses something about what's going on.
(I'm not claiming that I spend the freed-up time doing valuable things, or that reading mediocre books wouldn't be valuable - I'm just saying that the fall in reading doesn't apply to the activity itself so much as to the majority of content to which it would apply.)
The airplane thing is a small one and may or may not suit your lifestyle. But the bigger thing is that as a child or a teen, everything is new to you. There are some books that are just about guaranteed to suck you in and expand your worldview if you've never encountered them before. They are the low-hanging-fruit curriculum books that just about anyone will benefit from. Once you've exhausted the Catch-22s, the Mark Twains, the Tolkiens or Austens or Heinleins of the world, you'll have to spend more effort to find books that really resonate with you.
For me, this meant following sites like The Baffler and Electric Literature. I hope if you figure out where online people are reviewing and promoting the books you enjoy, you'll find yourself funneled toward books that are capable of drawing you in again.
As a concrete recommendation, I just finished The Overstory by Richard Wright, which won the Pulitzer Prize in fiction this year, and absolutely could not put it down.
I'll give the sites you recommend a whirl, thanks.
From there it's about training. It's almost like meditation where the more you do it, the longer your stretches of focus can become and the more quickly you can click your brain into "reading more." To ease back in I found graphic novels were a great start. They accustom you to sitting still and getting absorbed into things.