(1) Notwithstanding anything to the contrary contained in sections 28 to 43A, in the case of an assessee, being a non-resident, engaged in the business of operation of aircraft, a sum equal to five per cent of the aggregate of the amounts specified in sub-section (2) shall be deemed to be the profits and gains of such business chargeable to tax under the head "Profits and gains of business or profession".

(2) The amounts referred to in sub-section (1) shall be the following, namely :—

(a) the amount paid or payable (whether in or out of India) to the assessee or to any person on his behalf on account of the carriage of passengers, livestock, mail or goods from any place in India; and

(b) the amount received or deemed to be received in India by or on behalf of the assessee on account of the carriage of passengers, livestock, mail or goods from any place outside India.