I woudn't worry about the flying bit. I'd just hope you don't have an aversion to Mexican food at that point! Seriously though, I imagine that you do have some hesitancy about getting pregnant since you had a mc before. Maybe a trip to Mexico early in your pregnancy would be just the thing to keep your mind occupied and away from all the "what if" kind of thinking.
As for timing, I don't think there's a science to it. I think when you and your parnter *feel* like it's time, then it's time. I always thought I'd like to space my kids 3 years apart, but now that I have a son who's 13 months old, I'm ready to start trying for #2.
Good luck to you and let us know what you decide!
Chrissy, lucky mama to Noah (9), Lilah (6), Rowan (3) and Laney (1).