Although I'm not fond at all of Tom Clancy's politics, which bleed into some of his books a lot IMO, I do have fond memories of his really looooong title,
The Bear and the Dragon, which I picked up in a London airport and read all the way back home across the Atlantic, back in DTB days, after I had totally run out of the books that I had brought with me on a long combined work/vacation trip to Europe.
Bear saved me from having to (1) work

, (2) reread something, (3) actually open the seatback magazine, (4) watch the airline movies, or (5) sleep (which I did do some of too

).
It is so so awesome to be able to carry as many books as I want on my phone, or on an e-ink reader for long trips!
In any case,
Bear has dropped to $1.99 at Kindle and Kobo US.
Kindle US:
https://www.amazon.com/Bear-Dragon-J...dp/B001Q9J4PQ/
Kobo US:
https://www.kobo.com/us/en/ebook/the...and-the-dragon