Indurain, you may be doing nothing wrong. The fare I got was for March. May could simply have higher fares at the moment. Everything effects fares. Month, day of week, and even in my case time of day! (The $389 fare was only good on return flights from 5pm to 5am.) Not to mention Yield Management.
[This message has been edited by PremEx (edited 03-02-2000).]