Like I said previously folks, If that was a US registered X American Airlines B-727 reg.#N844AA , and it was converted to a fuel tanker last year. It has ten 500 gallon aluminum tanks bolted to the floor with 4 inch valves on each tank joined together by 4 inch high pressure hoses leading to the aft where refueling is accomplished. There is also a very unique vent system which allows almost zero fumes into the aircraft. The tanks are held to the seat tracks in four corners buy half inch bolts.(I would hate to see where the tanks would end up if a few G's were pulled) The aircraft was delivered to Luanda by a South African man known as Keith Irwin. Sorry I had to repeat his name again.