What bus line?

Thanks for this info. What bus lines did you use - Zihua to Morelia and then Morelia to SMA? It does sound like the best plan as we really don't want to go through Mexico City plus the plane is really expensive and we would still need a shuttle from the airport into SMA.

We used Parakuni on the route between Zihua and Morelia, Primera between Morelia and SMA and back to Morelia and then Autovias from Morelia back to Zihua. We have found little difference between any of the bus lines as far a either cost or comfort and have used the one that had the best departure times. We do like the double decker buses and will reserve the most forward seats on
the upper deck, great panoramic views from up there, lot's of leg room but those seats could be an issue if you suffer from any motion sickness, it does have a bit of a sway to the ride up top!