Very interesting thread is this.
One comment puzzles me however.
BTW: My employer together with Virgin Atlantic (hearsay) is pushing Airbus to allow some upper wing frost (cold soaked fuel), similar to what 737NG is allowed to.
My understanding is that even though Boeing consider it ok, the FAA (and every other NAA too) have insisted on the clean wing policy. I'm sure there's a directive somewhere.
Unless I'm just out of touch of course, again.
