Originally Posted by
ajoy
Thanks for your help. Yes, flight availability will likely be the main deciding factor. I've been noodling around both DL and UA websites to test the waters for when I actually book in late August.
Yes, it will likely cost more for those sisters paying $. I offered to teach them how to earn enough miles/points to get their tix, but they were uninterested!
Cash IS an issue specifically because we ARE traveling to Norway

It would be much cheaper if our ancestors had been from most anywhere else in the world!
For easy checking of flight availability, you might want to check out
Awardtravelr. It's free, easy to use, and allows you to easily switch between each alliance to check availability.
I'd still always cross-reference this with the actual airlines site later, but seeing as it uses the airline's sites to find the availability, you should be fine. I've been using Awardtravelr for a few months (since it launced) as my go-to to start planning out trips just because its so easy and convenient for people who can fly on any alliance (like yourself).