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Runway length is by no means crucial and it doesn't matter what the flaps are passing through when you rotate, although it is normally near to 15.
RAAF 737 BBJ happy to touch and go where I am, off the ILS, or land normally, but the 737 based Wedgetail AWAC reckons we aren't long enough at 7200ft. May have something to do with the squillion of dollars worth of gadgetry attached though?