This slip-up occurs when Black Mumba leaves the Hatori Hanzo shop and then travels by plane with the sword leaned onto the window of the plane ? I dont tnink that she would be allowed to take sword into the plane in any air company in the world.
Actually I believe she is travelling in a ficticious airline that allows you to take your own Katana in the flight with you, because when she is returning from killing O-ren you can see that other passengers have katanas with them, and they are taking them on a special katana case right next to the seats, so i believe this was all done to make the impression of the neo-samurai's in japan.
It was clearly a fictitious and 'mysterious' airline. At the end we see the outside of the 747, and there is no livery or company name. It's just a visual gag, a bit similar to The Living Daylights Bond movie, when the Mujahideen come through the airport armed to the teeth, and tell James they had some problems at customs.
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