It sounds like it was a 12,000 foot runway and if they got the weight wrong or more than likely south of the border they were given the wrong weights runway analysis could give you small flap setting. It appears they are using dial-a-flap performance and if figured long runway and light weight the flap setting may be 5 to 8 degrees. It will increase your ground roll but it helps in the second segment climb. Taking off with flaps 15 + degrees is alot of drag and the airplane does not accelerate well until the flaps are retracted. More than once in South America they would weigh the flowers or asparagus and then water them never accounting for the water and giving a max load to boot. Its just how things happen sometimes down there.......
Or in BOG you tell them to take off 6,000lb, they remove the pallet, reshuffle the same stuff and put it right back on and tell you it's good to go now.
The Old Lady can happily eat up 12,000ft of runway and have room for dessert.
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