Kenya International Airlines (KIA) is a foreign corporation, organized under the laws of Kenya. It is not licensed to do business in the Philippines. Its commercial airplanes do not operate within Philippine territory, or service passengers embarking from Philippine airports. The firm is represented in the Philippines by its general agent, Philippine Airlines (PAL), a Philippine corporation. KIA sells airplane tickets through PAL, and these tickets are serviced by KIA airplanes outside the Philippines. The total sales of airline tickets transacted by PAL for KIA in 1997 amounted to P2,968,156.00. The Commissioner of Internal Revenue assessed KIA deficiency income taxes at the rate of 35% on its taxable income, finding that KIA's airline ticket sales constituted income derived from sources within the Philippines. KIA filed a protest on the ground that the P2,968,156.00 should be considered as income derived exclusively from sources outside the Philippines since KIA only serviced passengers outside Philippine territory. Is the position of KIA tenable? Reasons.