I understand (but only to a certain extent) that the air line needs people with healthy skin. But if they insist that you become 'fair' I believe that you should ask them to visit a dermatologist :) I completely relate to your problem... but no one can 'make' you fair. You can only get the skin color which is your original. If you are in Mumbai, please visit the Skin, Hair and Laser Clinic in Mahim (behind paradise cinema,LJ road). We conduct sessions on Fairness Psychology. A whole lot of people are benefiting from it. All the best!
Ps: visit a dermatologist for 'healthy'Skin. Not fair skin :)