You won't need to be within 50 miles of your transplant center...believe me. I live in NY and my center is in Ohio, about 400 miles away from me.
Since the transplant, I have travelled to WA (state), NC, VA, NH, and this September I will be going to OK. The only thing I was told was to wear a mask when I'm travelling on a plane because it's not vented the whole time you're in there and you don't know if someone is sick or not. So far, the only trip that required a plane was the one to WA and I did fine with that. I'll be going on a plane again when I go to OK.
It's so much easier to travel after the transplant!