I used to be a frequent flier when I worked, and quite often had weather delays to contend with. I haven't traveled much since retiring though. It can be a real pain, these days.
On long delays, I like to walk around and get some exercise. I always travel with music and a good paperback, as well as reading on my iPad. Sometimes it's just nice to have the book in hand, and it doesn't weary the eyes as much as screen reading.
Don't forget to bring a good dose of patience with you. I know that may be hard for a lot of folks but there are some things you cannot control. So why get your feathers all ruffled? Stay calm and carry on. You'll feel better when you finally reach your destination.
"Music can change the world because it can change people." - Bono