That the imports and exports are undertaken through sea ports at Bombay, Calcutta, Cochin, Kandla, Mangalore, Marmagao, Madras, Nhava Sheva, Paradeep, Tuticorin and Visakhapatnam or through any of the airports at Ahmedabad, Bangalore, Bombay, Calcutta, Coimbatore, Delhi, Hyderabad, Jaipur, Madras, Srinagar, Trivandrum and Varanasi, or through any of the Inland Container Depots at Bangalore, Coimbatore, Delhi, Guwahati, Hyderabad, Kanpur, Ludhiana.