flying on leisure scheduled SJO-LAX. Right before departure they announced we have to make unannounced stop at LIR (20 mins away) because winds favor rwy 07 - guessing second segment climb causing probs from terrain. Surprising thing is headwinds are normal as said by CA - Alaska plans on rwy25 and whenever winds favor 07 they are screwed - adding 1.5 to flight time since its Costa Rica and nothing is easy. Didn't think any majors ran this way since JB used to have issues years ago. As bad as AA and UAL are I've never had an U expected Divert for fuel planning. Ouch. Typical?