Did any of you ever see that programme (it was on UK terrestrial TV
recently but probably came from Discovery originally) where they dismantled a 747?
It was the first one these guys had done - they were used to smaller birds - and if I remember correctly they used no less than four jacks and two fixed stands (one jack and one stand under each wing, one jack at the front, one jack at the rear). Having done this, they balanced the whole thing on stacks of railroad ties then deflated the jacks and unwound the stands and pulled them away - while running like hell.
I don't know whether they used so many beause they were being cautious or what.
On a further note, my new cat is called Jack. He's about a foot tall and weighs 12.5 pounds. I don't know how many of him you'd need to 'jack' up a 747 but I bet it's more than four.