Live by these rules at an airline pilot to being happily married....
1.) NEVER leave for a trip mad at each other....
2.) See Rule #1.
3.) See Rules #1 & #2
4.) Call her at some point EVERY day to let her know that you are thinking about her
5.) Random acts of kindness. Next time you are on your way home from you trip, stop by the grocery store and pick up a $5 bouquet of flowers. For no reason! When she asks why you bought them, tell her that you missed her while away.
6.) Make your time at home count! My wife and I try to spend my days off doing things together, just as if we were dating... Bike rides, museums, etc., and we even have a two year old now! We try to "do something" at least once beween trips.
7.) BE HONEST! I read an interesting article in the Wall Street Journal last week talking about the way to prevent cheating is to disclose when you like someone, with whom you may do something you regret BEFORE you cheat. If you are flying with a flight attendant that is getting flirty and you plan on going drinking that night, tell your wife about her before you go, and it will constantly be on your mind that night so that you will not cheat.... if you do cheat, this article said to disclose the event within 24 hours! (Last Friday or Saturdays' Personal Journal, cover..)
8.) Make sure that she knows that she is first in your book. You only get limited days off, so things like drinking with the guys, golf, etc... have to get put on hold, b/c she values your time at home more than you do.
9.) Take her out to eat once in a while. She will view that you go out all the time, have drinks with the rest of the crew, eating at restaurants, etc... all the time, while she is putting another Stouffers in the microwave. Even if you are a Slam-Clicker, she has a certain standard in her mind that you do on your trips. Even if you don't want to go out to eat b/c thats all you ever get to eat on the road, remember that she doesn't and deserves a treat every now and then.
10.) If you work for a company that has long overnights (more than 24 hours) in decent places, invite her to come with. It will make your trip more bearable when you are stuck in Dayton for 36 hours, AND it will make her feel wanted.
and finally
11.) SEE RULE #1! NEVER LEAVE FOR A TRIP MAD AT EACH OTHER! You are going to be gone for 4 days. Do you really want to wonder for those 4 days if someone else is keeping your bed warm for you?
Just a few thoughts on how to make your airline marriage work. If these don't work, I highly suggest a Swiss bank account where you can start funneling your money to, so you can start saving for your divorce and still have something left after it.