Jodie, Our gk's live about fifteen minutes from us and I see them at least once a week if not more. I would say to you, say a few more prayers and get on that plane and fly to wherever they are. You have so little time that they are young and before they off being teenagers and young adults. If you don't build that relationship with them now, you won't have it later.
I know our Sunday night dinners are more than just eating together, we're building memories and bonding with them so hopefully when they are teenagers and face others wanting to do what they shouldn't; they can say that's not something my parents or grandparents would want me to do. And that is something that is missing in alot of young adults today.
I know flying isn't fun but what you will get out of it and what it will mean to the GK's is well worth! Chris