According with a local newspaper, SJO is prepared to receive an IB A340 each Monday, Wednesday, Friday and Sunday nonstop from MAD. Nevertheless their new hubs in Central America will be GUA and PTY not SJO. MIA Hub get to an end.
All technical studies performed by Alterra Partners [administrator of SJO] shows that the airport is safe even for fully loaded departures according wit them.
As all we know, the beginning of such flights is the next October 2nd., 2004.
[Sorry to all, because I know this was discussed before, but considering this is a reality now I think this post is valid]