This is the part I reached in the game, and when I went to the Airships place nothing happend!!! So I took a ship to Nalbina and finished discovering the whole place and now I'm lost!! what should I do?!

You mean at the beginning?
Have you met Balthier in the Sandsea?
If you had, then go to the Western gate and enter the Aerodrome.
Its inside the Aerodrome.

Yes, thats excally what I did, I met him in the Sandsea and he asked me to met him in the Aero place. I went expecting to see a demo / schene but it didnt. So I took a ship to nalbina but after that I didnt know what to do.

note Balthier is in my party already

Go back to Rabanastre.
Western Side, Aerodrome.
Go inside the Aerodrome and search for Balthier.
He stand in front of a circle area.

Thanks alot, I'll try it first thing when I reach home. guess my brain didnt accept him to be in the party and in the Aerodrome hehe :P

I had a hard time with this too.. "huh.. I don't get it.. i have to take them OUT of my party for them to meet me." lol... usually FF series have always removed the character from the party if there was a task that needed to be done with them.

........... *giggles*

Fran is outside too, she tells you Balthier is waiting inside.