we were departing on AA last Monday and I noticed the AI 747 docked at TBIT was open - but not just the door, a huge section of the fuselage. Upon closer inspection, it appeared that this was the opening to the rear 1/3 of the fuselage which was all cargo - you could see the netting inside. Is this normal for AI to have 747s which are 2/3 pax and 1/3 cargo in the back? Are they the only airline doing this?