There is the Omsa bus (3 pesos) that runs down the 27 blvd. Catch the one that says Corredor 27 and ask the driver if he will pass NEAR the Sabana larga- he won't stop at it, but it is close to where he will stop. Get off and walk down the street nearest to the bus stop or ask people which way to Sabana larga- it is like a 5 min. walk from where the Omsa will let you off, and then you will find small vans and mini-buses waiting to go to the airport- if I remember correctly it is 20 pesos.
