AShankar works full-time at the shipyard. He goes to the airport only to park his aircraft, which he uses to commute from his house to his workplace. Let me explain -
The movie gives countless instances of air-travel & air-crafts being amazingly affordable & within the reach of the common man.(I'm sure this reflects Prabhuji's vision of a developed India.)I corroborate my theory with facts -1. The airport seems more like a taxi-stand/ parking lot. (a) Kalia Shetty assasinates kafanchor neta & cooly runs upto his getaway copter.
(b) Shankar keeps his yellow aircraft parked here perpetually.
(c) Anyone can freely walk or even sit & cry on the runway. No security hassles.2. Shankar's house is located in a rural area (Observe the deserted surroundings & poor lighting at his house). How do you suppose he goes to the shipyard everyday ? By his yellow aircraft, of course. (He's just got out of his aircraft, when he sees Kalia Shetty making a getaway & nabs him).3. If an aircraft is affordable to a coolie then obviously Ambassadors & rickshaws have to be dirt-cheap. That explains how you can line up 30-Ambassadors & 150-rickshaws at an instant's notice. Thus Shanker can easily own an Esteem.4. There are acres of barren land shown in many scenes (eg. climax fight with Bhulla, sister's rape, dad's way home before he gets murdered). These are obviously ear-marked for aircraft parking.